Researcher Database

MATSUGUCHI, Masanobu

FacultyGraduate School of Science and Engineering Materials Science and Biotechnology
PositionProfessor
Last Updated :2019/10/08

Researcher Profile and Settings

Profile and Settings

Name

  • Name

    MATSUGUCHI, Masanobu

Affiliations

Affiliation & Job

  • Section

    Graduate School of Science and Engineering Materials Science and Biotechnology
  • Job title

    Professor

Education, Etc.

Education

  • 1986
  • 1984
  • 1986, Kyushu University, Graduate School, Division of Natural Science, Chemistry
  • 1984, Kyushu University, Faculty of Science, Department of Chemistry

Degree

  • Master of Science ÷
  • Dr (Science)

その他基本情報

Association Memberships

  • Chemical Society of Japan
  • The Electrochemical Society of Japan
  • l
  • The Society of Polymer Science
  • Japano
  • Japan Association of Chemical Sensors

Committee Memberships

  • 2018/10 - 2019/10
  • 2002 - 2006
  • 2007 -
  • 2018/10 - 2019/10, The Chemical Society of Japan, Delegate
  • 2002 - 2006, Japan Association of Chemical Sensors, Editorial Board, Japan Association of Chemical Sensors
  • 2007 - , Japan Association of Chemical Sensors, Japan Association of Chemical Sensors

Academic & Professional Experience

  • 2016/04 - Today

Research Activities

Research Areas, Etc.

Research Areas

  • Chemistry, Physical chemistry
  • Applied Chemistry, Polymer chemistry
  • Material engineering, Structural/Functional materials

Research Interests

  • Industrial Physical Chemistry
  • Polymer Structure and Property(including Fiber)
  • Structural and Functional Materials
  • Chemical sensor
  • nano technology

Book, papers, etc

Published Papers

  • HCl gas sensor coating based on poly(N-isopropylacrylamide) nanoparticles prepared from water-methanol binary solvent, MATSUGUCHI Masanobu, Sensors, 2018/10, [Refereed], 10.3390/s18103283
  • Poly(N-isopropylacrylamide) nanoparticle-based gas sensor coating prepared from binary aqueous solutions, MATSUGUCHI Masanobu, Abstract of the 12th Asian Conference on Chemical Sensors, 2017/11, [Refereed]
  • Fabrication of poly(N-isopropylacrylamide) nanoparticles using a simple spray-coating method and applications for a QCM-based HCl gas sensor coating, MATSUGUCHI Masanobu, Sensors and Actuators B, 2017/11, [Refereed], 10.1016/j.snb.2017.05.130
  • A fractional exhaled nitric oxide sensor based on optical absorption of cobalt tetraphenylporphyrin derivatives, MIKI Hideshi, MATSUBARA Fumiya, NAKASHIMA Shunichi, OCHI Shinya, NAKAGAWA Katsuhiko, MATSUGUCHI Masanobu, SADAOKA Yoshihiko, Sensors and Actuators B, 2016/08, [Refereed], 10.1016/j.snb.2016.02.145
  • Morphological study of poly(N-isopropylacrylamide) on an application for a mass-sensitive HCl gas sensor, MATSUGUCHI Masanobu, TADA Ai, KUMADA Masashi, Abstract of the 11th Asian Conference on Chemical Sensors, 2015/11, [Refereed]
  • HCl gas adsorption/desorption properties of poly(N-isopropylacrylamide) brushes grafted onto quartz resonator for gas-sensing applications, MATSUGUCHI Masanobu, TAKAOKA Kenta, KAI Haruka, Sensors and Actuators B, 2015/03, [Refereed], 10.1016/j.snb.2014.10.137
  • Poly(N-isopropylacrylamide) nanoparticles for QCM-based gas sensing of HCl, Masanobu Matsuguchi, Noboru Harada, Satoshi Omori, Sensors and Actuators, B: Chemical, 2014/01, [Refereed], 09254005, 10.1016/j.snb.2013.08.095
  • Highly sensitive toluene vapor sensors using carbon black/amino-functional copolymer composites, Masanobu Matsuguchi, Koji Asahara, Takashi Mizukami, Journal of Applied Polymer Science, 2013/02, [Refereed], 00218995, 10.1002/app.37578
  • Properties and stability of polyaniline nanofiber ammonia sensors fabricated by novel on-substrate method, Masanobu Matsuguchi, Takuya Asahi, Sensors and Actuators, B: Chemical, 2011/12, [Refereed], 0925-4005, 10.1016/j.snb.2011.09.017
  • Design of polymer-based gas sensors, Masanobu Matsuguchi, Sensor Letters, 2011/04, [Refereed], 1546-198X, 10.1166/sl.2011.1638
  • Design of Polymer-Based Gas Sensors, Technical Digest of the 13th International Meeting on Chemical Sensors, 2010, [Refereed]
  • Fabrication of Polyaniline Nanofiber Films and Their NH3 Gas-sensing Properties, Abstract of the 7th Asian Conference on Electrochemistry, 2010, [Refereed]
  • Long-term stability of humidity sensor using polyaniline blend films upon DC operation, Masanobu Matsuguchi, Takashi Yamanaka, Makoto Yoshida, Shinya Kojima, Satoshi Okumura, Journal of the Electrochemical Society, 2009/09, [Refereed], 0013-4651|1945-7111, 10.1149/1.3184148
  • Toluene-Vapor Sorption of Chemically Modified Methyl Methacrylate-co-Chloromethyl Styrene Copoylmers with N,N,-dimethyl-1,3,-Propanediamine Measured with a Quartz Crystal Microbalance, MATSUGUCHI Masanobu, KAGEMOTO Muneyoshi, Journal of Applied Polymer Science, 2009/01, [Refereed], 0021-8995, 10.1002/app.30650
  • Chemically modified copolymer coatings for mass-sensitive toluene vapor sensors, Masanobu Matsuguchi, Toshiyuki Uno, Takashi Aoki, Masami Yoshida, Sensors and Actuators, B: Chemical, 2008/05, [Refereed], 0925-4005, 10.1016/j.snb.2007.12.052
  • Poly(acrylamide) derivatives for QCM-based HCl gas sensor applications, Masanobu Matsuguchi, Yoshito Kadowaki, Sensors and Actuators, B: Chemical, 2008/03, [Refereed], 0925-4005, 10.1016/j.snb.2007.10.049
  • Gas Adsorption Properties of Surface-confined Polyamidoamine Dendrimers on Quartz Resonators, MATSUGUCHI Masanobu,KOTANI Yorikazu, Extended Abstracts of the Papers Presented at the International Meeting on Chemical Sensors (IMCS 12), 2008, [Refereed]
  • HCl gas monitoring based on a QCM using morpholine-functional styrene-co-chloromethylstyrene copolymer coatings, Masanobu Matsuguchi, Yoshito Kadowaki, Kazutoshi Noda, Ryuichi Naganawa, Sensors and Actuators, B: Chemical, 2007/01, [Refereed], 0925-4005, 10.1016/j.snb.2006.02.039
  • Methanol permeability and proton conductivity of a semi-interpenetrating polymer networks (IPNs) membrane composed of Nafion® and cross-linked DVB, Masanobu Matsuguchi, Heisuke Takahashi, Journal of Membrane Science, 2006/09, [Refereed], 0376-7388, 10.1016/j.memsci.2006.04.043
  • Molecular imprinting strategy for solvent molecules and its application for QCM-based VOC vapor sensing, Masanobu Matsuguchi, Masanobu Matsuguchi, Toshiyuki Uno, Sensors and Actuators, B: Chemical, 2006/01, [Refereed], 0925-4005, 10.1016/j.snb.2005.02.028
  • A QCM-based HCl gas sensor coated with poly(acrylamide) derivatives, Proceedings of the 11th International Meeting on Chemical Sensors, 2006, [Refereed]
  • A QCM-based NO2 gas detector using morpholine-functional cross-linked copolymer coatings, Masanobu Matsuguchi, Yoshito Kadowaki, Masanori Tanaka, Sensors and Actuators, B: Chemical, 2005/07, [Refereed], 0925-4005, 10.1016/j.snb.2004.11.044
  • Depression of a capacitive-type humidity sensor's drift by introducing a cross-linked structure in the sensing polymer, Masanobu Matsuguchi, Makoto Yoshida, Takaaki Kuroiwa, Tsutomu Ogura, Sensors and Actuators, B: Chemical, 2004/09, [Refereed], 0925-4005, 10.1016/j.snb.2003.12.061
  • Improvements in the long-term stability of a LiCl dew-point sensor using cross-linked porous poly(vinyl alcohol) film, Masanobu Matsuguchi, Toshiyuki Uno, Ayumi Yamanaka, Takaaki Kuroiwa, Tsutomu Ogura, Yoshiro Sakai, Sensors and Actuators, B: Chemical, 2004/01, [Refereed], 0925-4005, 10.1016/j.snb.2003.07.007
  • Amino-functional cross-linked polymer coatings for QCM-based NO2 gas monitoring applications, Technical Digest of the 10th International Meeting on Chemical Sensors, 2004, [Refereed]
  • Effect of sensing film thickness on drift phenomenon of capacitive-type humidity sensors, Masanobu Matsuguchi, Yasunori Takahashi, Takaaki Kuroiwa, Tsutomu Ogura, Sachiko Obara, Yoshiro Sakai, Journal of the Electrochemical Society, 2003/08, [Refereed], 0013-4651|1945-7111, 10.1149/1.1592522
  • Effect of humidity on NH<inf>3</inf> gas sensitivity of polyaniline blend films, M. Matsuguchi, A. Okamoto, Y. Sakai, Sensors and Actuators, B: Chemical, 2003/08, [Refereed], 0925-4005, 10.1016/S0925-4005(03)00325-3
  • Monitoring of NO2 gas in air using piezoelectric crystals coated with amino-functional copolymers, Masanobu Matsuguchi, Masanori Tanaka, Electrochemistry, 2003/06, [Refereed], 13443542
  • Effect of crosslinked structure on SO<inf>2</inf> gas sorption properties in amino-functional copolymers, Masanobu Matsuguchi, Katsuya Sakurada, Yoshiro Sakai, Journal of Applied Polymer Science, 2003/04, [Refereed], 0021-8995|1097-4628, 10.1002/app.12135
  • Monitoring of NO<sub>2</sub> Gas in Air Using Piezoelectric Crystals Coated with Amino-functional Copolymers, Electrochemistry, 2003, [Refereed]
  • Effect of NH3 gas on the electrical conductivity of polyaniline blend films, M. Matsuguchi, J. Io, G. Sugiyama, Y. Sakai, Synthetic Metals, 2002/04, [Refereed], 0379-6779, 10.1016/S0379-6779(01)00504-5
  • Competitive sorption of water vapor and CO2 in photocrosslinked PVCA film for a capacitive-type humidity sensor, Masanobu Matsuguchi, Nozomi Maeda, Yoshiro Sakai, Journal of Applied Polymer Science, 2002/01, [Refereed], 0021-8995|1097-4628, 10.1002/app.10062
  • SO2 gas sensors using polymers with different amino groups, Masanobu Matsuguchi, Koji Tamai, Yoshiro Sakai, Sensors and Actuators, B: Chemical, 2001/06, [Refereed], 0925-4005, 10.1016/S0925-4005(01)00735-3
  • Humidity sensor based on alkali salts of poly(2-acrylamido-2-methylpropane sulfonic acid), Yoshiro Sakai, Masanobu Matsuguchi, Norimichi Yonesato, Electrochimica Acta, 2001/03, [Refereed], 0013-4686, 10.1016/S0013-4686(00)00746-5
  • Effect of matrix polymer on the NH3 sensing properties of polyaniline blend films, Proceedings of the 5th East Asian Conference on Chemical Sensors, 2001, [Refereed]
  • Effect of crosslinking structure on sorption of CO2 in photocrosslinked PVCA film, Masanobu Matsuguchi, Junichi Miura, Yoshiro Sakai, Journal of Applied Polymer Science, 2000/12, [Refereed], 00218995, 10.1002/1097-4628(20001205)78:10<1744::AID-APP50>3.0.CO;2-V
  • Drift phenomenon of capacitive-type relative humidity sensors in a hot and humid atmosphere, Masanobu Matsuguchi, Etsuro Hirota, Takaaki Kuroiwa, Sachiko Obara, Tsutomu Ogura, Yoshiro Sakai, Journal of the Electrochemical Society, 2000/07, [Refereed], 0013-4651|1945-7111, 10.1149/1.1393608
  • Humidity sensor using cross-linked poly(chloromethyl styrene), Y. Sakai, M. Matsuguchi, T. Hurukawa, Sensors and Actuators, B: Chemical, 2000/07, [Refereed], 0925-4005, 10.1016/S0925-4005(00)00313-0
  • Effect of Crosslinking Structure on Sorption of CO<sub>2</sub> in Photocrosslinked PVCA Filim, MATSUGUCHI M, MIURA J, SAKAI Y, Journal of Applied Polymer Science, 2000, [Refereed], 0021-8995|1097-4628, 10.1002/1097-4628(20001205)78:10<1744::AID-APP50>3.0.CO;2-V
  • Humidity sensor based on alkali salts of poly(2-acrylamido-2-methylpropane sulfonic acid), Abstract of the 7th International Symposium on Polymer Electrolytes, 2000, [Refereed]
  • SO2 gas sensors using a polymer with different amino groups, Abstract of 8th International Meeting on Chemical Sensors, 2000, [Refereed]

Books etc

  • 2014
  • 2008
  • 2003

Conference Activities & Talks

  • 2019/03
  • 2019/03
  • 2018/11
  • HCl gas adsorption/desorption chracteristics of NIPAM-BMA copolymer nanoparticles, ARIKAWA Daiki, MATSUGUCHI Masanobu, The 64th Chemical Sensor Symposium, 2018/09
  • 2017/11, 招待有り
  • 2017/09
  • 2017/09
  • Fabrication of surface-grated film of polyaniline and its ammonia gas sensing properties, KITAGATA Tokirou, YAGI Hajime, MATSUGUCHI Masanobu, The 62nd Chemical Sensor Symposium, 2017/09
  • Fabrication of PNIPAM nanoparticle films by using a cononsolvency effect and their HCl gas adsorption properties, FUJII Shinnosuke, YAGI Hajime, MATSUGUCHI Masanobu, The 62nd Chemical Sensor Symposium, 2017/09
  • 2016/11
  • FABRICATION OF POLY(N-ISOPROPYLACRYLAMIDE) PARTICLES USING SPRAY-COATING METHOD AND ITS HCl GAS ADSORPTION PROPERTIES, 2015/09
  • Functionalization of parylene-A films with polymer brushes for gas-sensing applications, SAKAGUCHI Tomoki, MATSUGUCHI Masanobu, The 59th Chemical Sensor Symposium, 2015/09

Misc

  • A Fractional Exhaled NO gas sensor using Porphyrin Derivatives, MATSUGUCHI Masanobu, Ddenki Kagaku, 86, 112, 117, 2018/06, 10.5796/denkikagaku.18-FE0013
  • 21, 5-6, 122, 127, 2008
  • 24, 1, 26, 30, 2008
  • 52, 7, 479, 2003, 10.1295/kobunshi.52.479
  • 17, 4, 143, 149, 2001
  • Humidity Sensors Using Chemically Modified Polymer Thin Films, Yoshiro Sakai, Masanobu Matsuguchi, Electrochemistry, 67, 67(10), 950, 956, 1999/10, 13443542, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033276729&origin=inward, Most of the humidity sensors practically used are based on the change in electrical properties of polymers or ceramics with humidity. They are either resistive-type or capacitive-type sensors. Various chemical modifications of polymeric materials have been utilized to improve the properties of sensors such as sensitivity, hysteresis, long-term stability, durability in unfavorable atmospheres such as dewdrops or vapors of volatile organic compounds(VOC), etc. This paper overviews the novel methods of chemical modification which have been proposed by the authors.
  • A Capacitive-type Relative Humidity Sensor Having a Double Layer Structure Consisting of a Photocrosslinked PVCa and a PMMa Film, Masanobu Matsuguchi, Shinya Kubo, Yoshiro Sakai, Electrochemistry, 67, 170, 174, 1999/02, 13443542, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033360569&origin=inward, A double layer structure sensor (DLS sensor) consisting of a photocrosslinked PVCA and a PMMA film was prepared. Advantages of the photocrosslinked PVCA sensor and the PMMA sensor were reflected in the initial sensor performance of the DLS sensor. The sensing characteristics were affected by the thickness and the degree of crosslinking of the photocrosslinked PVCA layer. There was an optimum PVCA film thickness (around 0.1 μm) for reducing the effect of both instantaneous and long-term coexistent acetone vapor.
  • 67, 2, 170, 174, 1999
  • 67(10), 950, 956, 1999
  • Sorption of CO2 in the photocrosslinked PVCA film, Masanobu Matsuguchi, Jun Ichi Miura, Yoshiro Sakai, Chemistry Letters, 229, 230, 1998/12, 03667022, 10.1246/cl.1998.229, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0032360437&origin=inward, Sorption behavior of CO2 in the photocrosslinked poly(vinyl cinnamate) film was examined. The amount of sorbed CO2 was enhanced with the degree of crosslinking, while the amount decreased beyond ca.95 % crosslinking.
  • Stability and reliability of capacitive-type relative humidity sensors using crosslinked polyimide films, Masanobu Matsuguchi, Takaaki Kuroiwa, Tetsuya Miyagishi, Sachiko Suzuki, Tsutomu Ogura, Yoshiro Sakai, Sensors and Actuators, B: Chemical, 52, 53, 57, 1998/09, 09254005, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0032156565&origin=inward, Newly developed crosslinked polyimide and fluorinated polyimide-based humidity sensors were fabricated for office building and factory applications. Both sensors showed good initial sensor performance. The stability and the reliability of these sensors were evaluated by exposing the sensor elements to various test conditions. The crosslinked polyimide sensor was resistant to chemicals and the crosslinked fluorinated polyimide one exhibited long-term stability in harsh environments. By using these sensors properly, their sensor performance is superior to that of most commercially available capacitive-type sensors. © 1998 Elsevier Science S.A. All rights reserved.
  • Characterization of polymers for a capacitive-type humidity sensor based on water sorption behavior, M. Matsuguchi, S. Umeda, Y. Sadaoka, Y. Sakai, Sensors and Actuators, B: Chemical, B49, 179, 185, 1998/07, 09254005, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0032121159&origin=inward, The water sorption behavior of polymers for a capacitive-type humidity sensor was examined using three different techniques. The sorbed water in hydrophilic polymers with a pyridine or hydroxyl group was highly bound and that in less hydrophilic polymers with a carbonyl or ether group was loosely bound to the polymer as determined from the sorption analysis. Among less hydrophilic polymers, the tendency to form the clustered sorbed water molecules was higher for PEG and EC, which have an ether oxygen as the hydrogen bonding basicity. The results of this study proved that cluster formation of sorbed water of a sensing polymer was closely related to the sensor's characteristics. The polymers with a weak hydrophilic site, which have a low hydrogen bond propensity, are suitable for the capacitive-type humidity sensor.
  • 52, 53, 57, 1998
  • 49, 3, 179, 185, 1998
  • 3, 229, 230, 1998, 0366-7022|1348-0715, 10.1246/cl.1998.229
  • Solvatochromic study of water sorption in polymer films, Masanobu Matsuguchi, Yoshihiko Sadaoka, Hiroshi Mizuguchi, Kenichi Umeda, Yoshiro Sakai, Journal of Applied Polymer Science, 63, 1681, 1691, 1997/03, 00218995, 10.1002/(SICI)1097-4628(19970321)63:12<1681::AID-APP18>3.0.CO;2-2, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0031097843&origin=inward, A solvatochromic method was used to characterize the water sorption behavior of polymer films. Four different dyes were dissolved in various solid polymers and the relative water vapor pressure in the atmosphere was changed. Evaluated solvatochromic parameters depended not only on the amount of sorbed water but also on the kind of polymer. A linear correlation between the ET(30) value and Taft's multiparameter was confirmed in both the dried and the water sorbed polymers. The correlation equation was almost identical to that obtained by other researchers in liquid solvents. These results suggest that the dissolved dyes behave as indicators of microenvironmental changes in the solid polymer film. © 1997 John Wiley & Sons, Inc.
  • 63, 12, 1681, 1691, 1997, 0021-8995, 10.1002/(SICI)1097-4628(19970321)63:12<1681::AID-APP18>3.0.CO;2-2
  • Effect of the film thickness on the humidity sensing characteristics of cross-linked PVCA film, Masanobu Matsuguchi, Masami Minomura, Yoshihiko Sadaoka, Takaaki Kuroiwa, Yoshiro Sakai, Electrochemistry, 64, 1107, 1112, 1996/12, 13443542, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0347070315&origin=inward
  • Carbon dioxide sensor using N,N-dimethylaminoethyl methacrylate and methyl methacrylate copolymer, Hirofumi Yokouchi, Masanobu Matsuguchi, Yoshihiko Sadaoka, Yoshiro Sakai, Sensors and Materials, 8, 69, 78, 1996/12, 09144935, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0030532748&origin=inward, N,N-dimethylaminoethyl methacrylate (DMAEM)-methyl methacrylate (MMA) copolymers with several different compositions were prepared by γ-ray irradiation. The sorption of carbon dioxide on the copolymer was measured by the frequency change of the 4 MHz quartz oscillators coated with the copolymers. Carbon dioxide sorption on the DMAEM-MMA copolymer was characterized by the dual sorption model (Henry type and Langmuir type). The fraction of Henry-type sorption is the smallest for the copolymer with 0.1 DMAEM mole fraction. A fast-response sensor could be fabricated when a copolymer with 0.1 DMAEM mole fraction was used.
  • Humidity sensors based on polymer thin films, Y. Sakai, Y. Sadaoka, M. Matsuguchi, Sensors and Actuators, B: Chemical, 35, 85, 90, 1996/09, 09254005, 10.1016/S0925-4005(96)02019-9, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0030234081&origin=inward, Studies on humidity sensors fabricated with organic polymers for the last 10 years are reviewed. Several useful methods for improving the characteristics of humidity sensors based on polymers are proposed. In the case of a resistive-type sensor, cross-linking of hydrophilic polymers or formation of interpenetrated polymer networks with a hydrophobia polymer makes the hydrophilic polymers durable at high humidities. Graft polymerization is another method of preparing water-resistive humidity sensors. In the case of capacitive-type sensors, cross-linking is also useful to modify the hydrophobic polymer to produce a sensor with small hysteresis, high selectivity and high sensitivity.
  • Effect of the degree of cross-linking on the characteristics of a PVCA capacitive-type humidity sensor, Masanobu Matsuguchi, Masafumi Shinmoto, Yoshihiko Sadaoka, Takaaki Kuroiwa, Yoshiro Sakai, Sensors and Actuators, B: Chemical, 34, 349, 355, 1996/08, 09254005, 10.1016/S0925-4005(96)01826-6, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0013050126&origin=inward, A cross-linked PVCA film was prepared on a suitable substrate by using a photoirradiation technique and evaluated as a capacitive-type humidity sensor. The sensing characteristics were considerably affected by the degree of cross-linking in the film. The sensitivity was particularly enhanced up to ca. 95% cross-linking, beyond this the sensitivity decreased. This has been explained by the variation in the ability to adsorb water with the degree of cross-linking. Similar behavior was observed for the adsorption of organic vapors and the adsorption of the larger organic vapors was greatly reduced by using the highly cross-linked polymer. This behavior was explained by the molecular sieve effect of the cross-linked film. It was confirmed that the effect of coexistent acetone vapor was considerably smaller for the sensor using highly cross-linked PVCA film.
  • 35, 1/3, 85, 90, 1996, 0925-4005, 10.1016/S0925-4005(96)02019-9
  • 64, 10, 1107, 1112, 1996
  • 34, 1/3, 349, 355, 1996, 0925-4005, 10.1016/S0925-4005(96)01826-6
  • 8, 2, 069-078, 1996
  • Effect of cross-linking degree of PVCA film on the characteristics of capacitive-type humidity sensor, Masanobu Matsuguchi, Masafumi Shinmoto, Yoshihiko Sadaoka, Takaaki Kuroiwa, Yoshiro Sakai, International Conference on Solid-State Sensors and Actuators, and Eurosensors IX, Proceedings, 2, 825, 828, 1995/12, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029546859&origin=inward, A cross-linked PVCA film was prepared on the substrate by using photoirradiation technique and it was applied for the capacitive-type humidity sensor. The sensitivity was enhanced until the cross-linking degree became ca. 95%, while further progress of the reaction resulted in the decrement of the sensitivity. This was related to the variation of water adsorption ability with the cross-linking degree. A similar behavior was observed for the adsorption of other organic vapors. These behaviors were explained by the microhole distribution change in the film with the progress of the cross-linking reaction.
  • Effect of carbon dioxide on the electrical conductivity of polyethylene glycol-alkali carbonate complex film, Yoshiro Saikai, Yoshihiko Sadaoka, Masanobu Matsuguchi, Hirofumi Yokouchi, Kazuhiko Tamai, Materials Chemistry & Physics, 42, 1, 73, 76, 1995/01, 0254-0584, 10.1016/0254-0584(95)80043-3, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029390991&origin=inward, A solid film consisting of triethylene glycol, K2CO3-polyethylene glycol of high mol. wt., was prepared on a sintered alumina substrate with a pair of golden electrodes and their electrical conductivity was measured. When CO2 gas was introduced into the air, the conductivity decreased. This change was reversible. The sensitivity to CO2, designated as (change in conductivity caused by CO2)/(conductivity in air), was the highest when a polyethylene glycol of mol. wt. 6000 was used. The sensing mechanism was interpreted in terms of the change in concentration of the charge carrier K+ ion by CO2. © 1995.
  • Humidity sensor durable at high humidity using simultaneously crosslinked and quaternized poly(chloromethyl styrene), Yoshiro Sakai, Yoshihiko Sadaoka, Masanobu Matsuguchi, Hiroki Sakai, Sensors and Actuators: B. Chemical, 25, 1/3, 689, 691, 1995/01, 0925-4005, 10.1016/0925-4005(95)85152-6, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029292576&origin=inward, In order to prepare a resistive-type humidity sensor that is durable at high humidities or even in dewing, poly(chloromethyl styrene) is simultaneously crosslinked and quaternized (that is, a quaternary ammonium group is added to the polymer) by the reaction with N,N,N′,N′-tetramethyl-1,6-hexanediamine on the surface of an alumina substrate on which a pair or gold electrodes is previously deposited. The sensor is durable even after soaking in water for two hours. The response time is shorter in samples with a higher degree of quaternization. An interpenetrating polymer network (IPN) film is also formed on a similar substrate using the crosslinked quaternized poly(chloromethyl styrene) and ethyleneglycol dimethylacrylate. A sensor based on the IPN film has a shorter response time than a sensor based on the crosslinked quaternized poly(chloromethyl styrene). © 1995.
  • A thin-film polysulfone-based capacitive-type relative-humidity sensor, Takaaki Kuroiwa, Tetsuya Miyagishi, Akihiko Ito, Masanobu Matsuguchi, Yoshihiko Sadaoka, Yoshiro Sakai, Sensors and Actuators: B. Chemical, 25, 692, 695, 1995/01, 09254005, 10.1016/0925-4005(95)85153-4, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029292053&origin=inward, A capacitive-type relative-humidity sensor utilizing a thin polysulfone (PSF) sensing material has been fabricated to achieve reproducible relative-humidity measurements with long-term stability even in hot and humid conditions. The sensor showed a good initial performance with 0.5%U(%r.h) hysteresis and 0.1±0.1%U °C-1 temperature coefficient of capacitance along with good stability with less than +3%U shift after 1000 h of exposure to 40 °C, 90%U conditions. © 1995.
  • 63, 9, 841, 846, 1995
  • 63, 4, 325, 328, 1995
  • 141, 3, 614, 618, 1994, 0013-4651, 10.1149/1.2054779
  • 67, 1, 46, 51, 1994, 0009-2673|1348-0634, 10.1246/bcsj.67.46
  • Detection of carboxylic acid vapor using poly(N,N-dimethylaminoethyl methacrylate), Yoshiro Sakai, Yoshihiko Sadaoka, Masanobu Matsuguchi, Tatsumi Saito, Sensors and Actuators: B. Chemical, 14, 1/3, 625, 626, 1993/01, 0925-4005, 10.1016/0925-4005(93)85120-Y, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027608243&origin=inward
  • A thin film polyimide based capacitive type relative humidity sensor, Takaaki Kuroiwa, Tomohito Hayashi, Akihiko Ito, Masanobu Matsuguchi, Yoshihiko Sadaoka, Yoshiro Sakai, Sensors and Actuators: B. Chemical, 13, 1/3, 89, 91, 1993/01, 0925-4005, 10.1016/0925-4005(93)85331-4, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027590717&origin=inward, A capacitive type relative humidity sensor utilizing newly developed cross-linked fluorinated polyimide has been fabricated using thin film technology and evaluated for commercial building and factory applications. The sensor showed a good initial performance with less than 1% r.h. hysteresis and a 0 ± 0.1% r.h./°C temperature coefficient of capacitance along with good stability especially under high temperature and high humidity conditions. Also, because of the inherent chemical resistance of the polyimide, good sensor stability when subjected to volatile environments has been demonstrated. © 1993.
  • Effect of Sorbed Water on the Dielectric Properties of Acetylene-Terminated Polyimide Resins and Their Application to a Humidity Sensor, M. Matsuguchi, T. Kuroiwa, Y. Sadaoka, A. Ito, K. Nosaka, M. Ishibashi, Y. Sakai, Journal of the Electrochemical Society, 140, 3, 825, 829, 1993/01, 0013-4651, 10.1149/1.2056166, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84975395971&origin=inward, A cured acetylene-terminated polyisoimide oligomer was used to prepare a capacitive-type humidity sensor. Sorption behavior of water on the cured film was examinedby measuring the dielectric constant and water content. The amount of sorbed water was small and the sorbed water did not form clusters. This is due to the hydrophobic nature and rigid structure of the film. The sorption behavior reflects its excellent sensor properties, i.e., low hysteresis, low temperature coefficient, durability against acetone vapor, and long-term stability in a high temperature and humid atmosphere. Among the polyimides prepared by curing the oligomers with different chain lengths, the mostsuitable composition for a reliable capacitive-type humidity sensor was API-3-API-1. © 1993, The Electrochemical Society, Inc. All rights reserved.
  • Solid state electrochemical CO2 gas sensor using zircon-based sodium ionic conductors, Y. Sadaoka, M. Matsuguchi, Y. Sakai, D. Manabe, Journal of Materials Science, 28, 8, 2035, 2039, 1993/01, 0022-2461, 10.1007/BF00367559, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027578045&origin=inward, The sensing properties and characteristics of a zircon-based sodium ionic conductor as an electrochemical CO2 gas sensor which can be expressed as O2, Pt|Na ion conductor|Pt, Na2CO3, CO2, O2 were examined. The electro motive force (e.m.f.) was found to be a function of the logarithm of CO2 concentration and the 90% response time was less than 2 min at 430°C while the number of electrons for the electrochemical reaction was slightly above than 2. The coexistence of water molecules (≥ 90% RH) induced the response time delay and the lowering of the e.m.f. value. Changes in the response characteristics were mostly recovered after cutting off the water vapour, while the recovery time was prolonged when the working temperature was increased. © 1993 Chapman & Hall.
  • 140, 2, 432, 436, 1993, 0013-4651, 10.1149/1.2221063
  • Ionic conductivity in Na<inf>5</inf>YSi<inf>4</inf>O<inf>12</inf>-based ceramics with and without additives, Y. Sadaoka, M. Matsuguchi, Y. Sakai, K. Komatsubara, Journal of Materials Science, 27, 18, 5045, 5051, 1992/09, 0022-2461, 10.1007/BF01105272, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34249838746&origin=inward, Addition of Na2O-Y2O3-SiO2 glass to Na5YSi4O12 during the sintering process induced enhancements in conductivity and decrease in its activation energy. The highest conductivity and activation energy were 1.3×10-1 S cm-1 at 300 ‡C and 0.21 eV, respectively, for Na5YSi4O12 with about 20 wt% Na2O-Y2O3-SiO2 glass which was sintered at 1000 ‡C. This improvement may be caused by the formation of a Na5YSi4O12 phase from the added glass. Such an improvement in the electrical characteristics was not achieved by the addition of 10 wt% or more Na2O-Al2O3-4SiO2 glass or α-alumina in which the conductivity decreased monotonically with an increase in the amount of additive. © 1992 Chapman & Hall.
  • Optical humidity sensing characteristics of composite thin films of hydrolysed nafion-dye with a terminal N-phenyl group, Yoshihiko Sadaoka, Masanobu Matsuguchi, Yoshiro Sakai, Yu Uki Murata, Journal of Materials Science, 27, 18, 5095, 5100, 1992/09, 0022-2461, 10.1007/BF01105279, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0000752775&origin=inward, By using composite films of hydrolysed nafion and dyes having cyanine or triphenyl structures and with a terminal N-phenyl group, an optical humidity sensor has been fabricated. In the reflection mode, the optical intensity of the absorption peaks which depend on the used dyes decreases with relative humidity. The raising and recovery times are less than 1 min. In dry air, the alkyl amine group reacted with SO3H of hydrolysed nafion and formed a proton additive. Sorption of water molecules induces the deprotonation of the quaternized ammonium group. © 1992 Chapman & Hall.
  • Effect of heat pretreatment on electrical conductance changes by NO<inf>2</inf> adsorption of lead phthalocyanine thin film, Y. Sadaoka, M. Matsuguchi, Y. Sakai, Y. Mori, Journal of Materials Science, 27, 5215, 5220, 1992/01, 00222461, 10.1007/PL00020242, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0041850603&origin=inward, The sensing characteristics of an NO2 gas sensor using lead phthalocyanine thin film are influenced by heat-pretreatment time and ambient gas. The response behaviour of conductance for the change in ambient gas was characterized using Elovich's equation. The first stage in the adsorption and desorption kinetics reflects surface phenomena and the second stage the film diffusion. Both components were improved by heat treatment in air. The rising time in the NO2 adsorption process was within 2 min, and the recovery time within 5 min at 130 °C for the film annealed in air for 1 h. The heat pretreatment induced the formation of a continuous layer of fine particles, ∼ 0.1 μm in size, and larger single crystals isolated from each other, which formed on the continuous layer. The formation of the larger single crystals is not preferable in fabricating a sensor with fast rising and recovery times. © 1992, Chapman & Hall. All rights reserved.
  • Optical humidity sensing characteristics of Nafion-dyes composite thin films, Yoshihiko Sadaoka, Masanobu Matsuguchi, Yoshiro Sakai, Yu uki Murata, Sensors and Actuators: B. Chemical, 7, 1/3, 443, 446, 1992/01, 0925-4005, 10.1016/0925-4005(92)80340-4, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026838016&origin=inward, By using composite films of hydrolyzed Nafion and dyes having a terminal N-phenyl group, an optical humidity sensor has been fabricated. In the reflection mode, the optical intensity of the absorption peaks which depend on the dyes used was influenced by relative humidity. In dry air, the alkyl amine group reacted with SO3H of hydrolyzed Nafion and formed a proton additive. Sorption of water molecules induces the deprotonation of the quaternized ammonium group. © 1992.
  • 27, 19, 5215, 5220, 1992, 0022-2461, 10.1007/BF02403819
  • 1, 53, 56, 1992, 0366-7022|1348-0715, 10.1246/cl.1992.53
  • Water resistive humidity sensor composed of interpenetrating polymer networks of hydrophilic and hydrophobic methacrylate, Y. Sakai, Y. Sadaoka, M. Matsuguchi, K. Hirayama, Transducers '91, 562, 565, 1991/12, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026392288&origin=inward, An interpenetrating polymer network (IPN) film composed of cross-linked 2-hydroxy-3-methacryl-oxypropyl trimethylammonium chloride (HMPTAC) polymer and cross-linked ethylene glycol dimethacrylate (EGDMA) polymer was formed on a sintered alumina substrate with interdigitated gold electrodes to fabricate a water-resistive humidity sensor. The impedance of the sensor decreased from ca. 10 7 Ω to ca. 10 2 Ω with increasing humidity from 0% RH to 90% RH. In spite of the cross-linking and interpenetrating with the hydrophobic polymer, the sensitivity is almost the same as that of the HMPTAC homopolymer sensor. Little hysteresis was observed. The characteristics of this IPN sensor changed little even after soaking in water for 120 min. This sensor is more water-resistive than other IPN sensors prepared by using melamine resin or HEMA polymer as a second incorporating polymer. It seems that this is due to the good compatibility of HMPTAC and EGDMA.
  • Effect of crystal form on the conductance in oxidative gases of metal-free and some metal phthalocyanines, Y. Sadaoka, M. Matsuguchi, Y. Sakai, Y. Mori, W. Göpel, Sensors and Actuators: B. Chemical, 4, 3/4, 495, 498, 1991/01, 0925-4005, 10.1016/0925-4005(91)80157-F, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026172379&origin=inward, The conductance of a semiconductor can be expressed by the Meyer-Neldel relation, i.e., σ = σ*exp(E/kT*)exp(-E/kT); the adsorption of an oxidative molecule induces a decrease in the activation energy, while the pre-exponential factor is almost unchanged. T* for phthalocyanine films is considerably higher than that for whiskers. This difference arises because the interaction between phthalocyanine and an adsorbed molecule is a function of the depth from the phthalocyanine surface. The activation energy for conduction is almostly uninfluenced by the crystal form, i.e., film and whisker. © 1991.
  • A Capacitive-Type Humidity Sensor Using Cross-Linked Poly(methyl methacrylate) Thin Films, M. Matsuguchi, T. Kuroiwa, Y. Sadaoka, A. Ito, Y. Sakai, Journal of the Electrochemical Society, 138, 6, 1862, 1865, 1991/01, 0013-4651, 10.1149/1.2085886, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026173423&origin=inward, A capacitive-type humidity sensor was prepared using cross-linked poly(methyl methacrylate) (PMMA). The electrical capacitance changed linearly with the relative humidity over the range of 10-90% RH and the sensitivity (the ratio of capacitance at 90% RH to that at 10% RH) was about 1.13. The amount of sorbed water on PMMA at 90% RH was 25 mg/g which was one-third of that on cellulose acetate butyrate. This low hygroscopicity of PMMA was effective in reducing any hysteresis. The decrement of temperature coefficient and high durability for acetone vapor were achieved using the crosslinked PMMA film with divinyl benzene or ethylene glycol dimethacrylate as the cross-linking agent. © 1991, The Electrochemical Society, Inc. All rights reserved.
  • A Humidity Sensor Using Polytetrafluoroethylene-Graft-Quaternized-Polyvinylpyridine, Yoshiro Sakai, Yoshihiko Sadaoka, Masanobu Matsuguchi, Yoshiaki Kanakuro, Masaharu Tamura, Journal of the Electrochemical Society, 138, 8, 2474, 2478, 1991/01, 0013-4651, 10.1149/1.2085997, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026202641&origin=inward, On polytetrafluoroethylene films (0.05 and 0.5 mm thick), polyvinylpyridine was graft-polymerized by γ-ray irradiation. After quaternization of the pyridyl group of the grafted films, sandwich and surface-type sensors were prepared by vacuum deposition of gold electrodes. Electrical properties of these resistive-type sensors were studied in relation to the grafting ratio as well as the amount of sorbed water. Scanning electron microscopy observations and impedance measurements suggest that for the 0.05 mm film, graft-polymerization proceeds homogeneously into the film, while for the 0.5 mm film, the reaction is limited only near the surface of the film and is inhomogeneous. The prepared sensor is completely resistant to water. © 1991, The Electrochemical Society, Inc. All rights reserved.
  • Optical-fibre and quartz oscillator type gas sensors: Humidity detection by Nafion® film with crystal violet and related compounds, Y. Sadaoka, M. Matsuguchi, Y. Sakai, Sensors and Actuators: A. Physical, 26, 1/3, 489, 492, 1991/01, 0924-4247, 10.1016/0924-4247(91)87038-5, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026123285&origin=inward, By using Nafion® film with crystal violet and malachite green, an optical-fibre and quartz oscillator type humidity sensor has been fabricated. The optical intensity, with a minimum at 615 nm in the reflection mode, decreases with relative humidity for a film with malachite green. The rise and recovery times are less than 1 min and the hysteresis is only ± 1%RH at 50%RH. For the film with crystal violet, a similar characteristic is confirmed at 630 nm. Composite films can be used as an optical and quartz oscillator type humidity sensor, since the sorption of water induces colour and oscillating frequency changes. © 1991.
  • Optical fiber humidity sensor using nafionr-tri-phenylcarbinol composite, Yoshihiko Sadaoka, Masanobu Matsuguchi, Yoshiro Sakai, Journal of the Electrochemical Society, 138, 2, 614, 615, 1991/01, 0013-4651, 10.1149/1.2085639, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026105580&origin=inward, By using Nafion1 film with tri-phenylcarbinol, the optical fiber humidity sensor was fabricated. The optical intensity around 450 nm in the reflection mode increases with the relative humidity. The resolution, i.e., the sensitivity to the relative humidity decreases in the range above 30% relative humidity. In a dry atmosphere, the dye exists in the form of tri-phenylcarbonium ion, and with increasing the relative humidity, the dye structure changes from the carbonium ion to carbinol. © 1991, The Electrochemical Society, Inc. All rights reserved.
  • 40, 3, 30, 36, 1991
  • 4, 717, 720, 1991, 0366-7022|1348-0715, 10.1246/cl.1991.717
  • Electrical conduction and microstructure of Ag2O-B2O3 glass and Ag3Zr2Si2PO12 composites, Y. Sadaoka, M. Matsuguchi, Y. Sakai, Journal of Materials Science Letters, 9, 1028, 1032, 1990/09, 02618028, 10.1007/BF00727867, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0025490943&origin=inward
  • Adsorption of cholesterol at hexane/water interface, M. Matsuguchi, M. Aratono, K. Motomura, Bulletin of the Chemical Society of Japan, 63, 17, 20, 1990/06, 00092673, 10.1246/bcsj.63.17, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0025283807&origin=inward, The interfacial tension between hexane solution of cholesterol and water was measured as a function of temperature and the mole fraction of cholesterol in hexane under atmospheric pressure. The interfacial tension vs. mole fraction of cholesterol curve was observed to have two break points at a certain temperature; the concentration of the break point increases with increasing temperature. The experimental results were analyzed by applying the rigorous thermodynamics of adsorption at interfaces developed previously. The excess number of moles of cholesterol and the thermodynamic quantity changes associated with its adsorption were found to show the discontinuous changes at the break points. It was concluded that the first-order phase transition takes place from the gaseous to the expanded state and from the expanded to the condensed one in the adsorbed film of cholesterol at the hexane/water interface.
  • Ionic conductivity and crystal structure of fired crystalline zirconium phosphate completely and half exchanged with some monovalent cations, Y. Sadaoka, Y. Sakai, M. Matsuguchi, Journal of Materials Science, 24, 2081, 2092, 1989/06, 00222461, 10.1007/BF02385425, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024681586&origin=inward, For LiLi-form, the decomposition of dilithium zirconium phosphate with a layered structure and formation of lithium dizirconium triphosphate and zirconium pyrophosphate was achieved by firing at 600°C or above. For NaNa- and KK-forms, any distinct variations of the external apperance were not confirmed by heat-treatments, while the crystal growth was detected for RbRb- and CsCs-forms fired at 900°C. For half ion-exchanged forms, monovalent cation dizirconium triphosphate was mainly formed on heating up to 600°C or above. The activation energy in ionic conduction decreases with increasing monovalent cation radius. This dependency can be realized by Anderson and Stuart's model based on the classical ideas of ionic crystal theory and elasticity theory. The activation energy for the fully exchanged form is slightly higher than that for the half-exchanged form and the pre-exponential factor in σT=σ0 exp (-E/kT) for the former is less than that for the latter. © 1989 Chapman and Hall Ltd.
  • Effects of firing temperature on morphology and crystal structure of zirconium bis(monohydrogen phosphate) and its alkali salts, Y. Sadaoka, M. Matsuguchi, Y. Sakai, S. Mitsui, M. Toita, K. Hatanaka, Journal of Materials Science, 24, 432, 438, 1989/02, 00222461, 10.1007/BF01107423, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024607148&origin=inward, In zirconium bis(monohydrogen phosphate)monohydrate, the stability of water of crystallization and of the crystal form was strongly influenced by its crystal size. The water of crystallization of a smaller crystal was completely released on heating to 200° C while a part of this water was held at 300° C in a larger crystal with a diameter of several micrometres. While a smaller crystal was decomposed by heating to 900° C and cubic zirconium pyrophosphate was formed, for a larger crystal, α-layered zirconium pyrophosphate was formed instead of cubic zirconium pyrophosphate and a layered structure was held. For the Na2-, K2- and Rb2-forms, good layer structure was retained even by heating to 1000° C. For the Li2-form, the layer structure was decomposed on heating at or above 900° C. The thermal stability of the layered structure increased with increasing crystal size and ionic radii of the alkali cation. © 1989 Chapman and Hall Ltd.
  • A Humidity Sensor using Cross-Linked Quaternized Polyvinylpyridine, Yoshiro Sakai, Yoshihiko Sadaoka, Masanobu Matsuguchi, Journal of the Electrochemical Society, 136, 171, 174, 1989/01, 00134651, 10.1149/1.2096579, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024302352&origin=inward, Poly(4-vinylpyridine) was simultaneously cross-linked and quaternized with α, ω-dichloroalkane on the surface of an alumina substrate that had a pair of gold electrodes on it. The impedance of this device varied from 107 to 103Ω for the entire humidity range. The effect of preparation conditions such as reaction time or quaternizing reagents on the electrical properties as a humidity sensor was investigated. The resistivity depends on the amount of sorbed water regardless of the degree of quaternization. © 1989, The Electrochemical Society, Inc. All rights reserved.
  • Humidity sensor using microporous film of polyethylene-graft-poly-(2-hydroxy-3-methacryloxypropyl trimethyl-ammonium chloride), Y. Sakai, Y. Sadaoka, M. Matsuguchi, V. L. Rao, Journal of Materials Science, 24, 101, 104, 1989/01, 00222461, 10.1007/BF00660939, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024303634&origin=inward, An hydrophilic monomer, 2-hydroxy-3-methacryloxypropyl trimethylammonium chloride, was graft-polymerized in a microporous polyethylene film using three different initiation methods, that is, with benzyl peroxide, pre-U.V. irradiation and mutual photo-initiation. Humidity dependence of the impedance was measured for the grafted microporous polyethylene films. Among the three graft polymers, the one prepared by pre photo-irradiation seems to have the most homogeneously grafted layer. The impedance increases as the grafting percentage increases except in the low grafting percentage region. The response time for the abrupt change of humidity becomes longer as the grafting percentage increases. The activation energy for conductivity has a maximum at 40% relative humidity in the plot of activation energy against humidity. © 1989 Chapman and Hall Ltd.
  • Humidity sensors based on organopolysiloxanes having hydrophilic groups, Y. Sakai, Y. Sadaoka, M. Matsuguchi, N. Moriga, M. Shimada, Sensors and Actuators, 16, 359, 367, 1989/01, 02506874, 10.1016/0250-6874(89)85006-1, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024640126&origin=inward, Two types of humidity sensors were prepared from organosilicon compounds having hydrophilic groups such as NH2, N +(CH3)3Cl- and SO3H. The first is a pressed silica gel disk grafted with hydrophilic organosilicon compounds. The second type is a sintered alumina plate on which a cross-linked organopolysiloxane film having a hydrophilic group was formed. The impedance was measured in the humidity range 0 - 100%. The impedance varies with the hydrophilic group in the order SO3H < N +(CH3)3Cl- < NH2 < OH. Also the amount of adsorbed water depends on these groups, according to the order N +(CH3)3Cl- > SO3H > NH2 > OH. The grafted silica gel device is quite resistant to water. The humidity-sensing characteristics of the alumina-plate type sensor do not change even after soaking in water for several hours. © 1989.
  • Electrical conductivity of Na<inf>3</inf>Zr<inf>2</inf>Si<inf>2</inf>PO<inf>12</inf>-doped sodium aluminosilicate glass, Y. Sadaoka, M. Matsuguchi, Y. Sakai, S. Nakayama, Journal of Materials Science, 24, 1299, 1304, 1989/01, 00222461, 10.1007/PL00020211, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024640597&origin=inward, To improve the electrical conductivity of sodium aluminosilicate glass and Na3Zr2Si2PO12 crystal, crystal-glass composite systems were examined. For the ceramics with a lower content of the glass, the activation energy of ionic conduction was lowered and the conductivity enhanced by adding glass and the pre-exponential factor was lowered. Whilst the activation energy of ionic conduction of Na2O-Al2O3- XSiO2 (X=4, 6) glasses could not be lowered to the limiting value of ca. 0.5 eV, the glass-based sample doped with Na3Zr2Si2PO12 powder indicated that the high ionic conductivity and its activation energy was lowered to ca. 0.3 eV. The composite of Na3Zr2Si2PO12 crystalline powder and sodium aluminosilicate glass is a useful material to the solid electrolyte. © 1989, Chapman and Hall Ltd.. All rights reserved.
  • A humidity sensor using graft copolymer with polyelectrolyte branches, Y. Sakai, Y. Sadaoka, M. Matsuguchi, V. L. Rao, M. Kamigaki, Polymer, 30, 6, 1068, 1071, 1989/01, 0032-3861, 10.1016/0032-3861(89)90081-5, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024680757&origin=inward, 2-Hydroxy-3-methacryloxypropyl trimethylammonium chloride was grafted on to the pore wall of microporous polyethylene film by a γ-ray pre-irradiation method. A humidity sensor was prepared by depositing gold electrodes on both surfaces of the grafted film. Complex impedance measurements were carried out at various humidities. From the complex impedance analysis, the values of parallel resistance and parallel capacitance were estimated. The parallel resistance decreased as the humidity increased, while the parallel capacitance remained constant. The parallel resistance also decreased as the grafting ratio increased. The value of parallel resistance depends on the amount of sorbed water in the film. The sensor is stable for a long time in ordinary atmospheric conditions. It is even stable in water for more than 2 h. The sensor prepared by γ-ray pre-irradiation at 9.0 × 104 R h-1 for 4 h was heat-resistant up to 130°C.
  • Electrical properties of α-zirconium phosphate and its alkali salts in a humid atmosphere, Y. Sadaoka, M. Matsuguchi, Y. Sakai, S. Mitsui, Journal of Materials Science, 23, 2666, 2675, 1988/08, 00222461, 10.1007/BF00547435, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0024056966&origin=inward, Humidity dependence of impedance was examined by using the complex impedance analysis for fine crystalline zirconium bis(monohydrogen phosphate) monohydrate and its alkali salts. The value of C0 in Cp(ω)=C0(j ω/ω0)-α was hardly dependent on the relative humidity and monovalent cation species. The resistive component and its activation energy decreased with increase in the relative humidity and the former was expressed as R=R* exp (-E/kT*) exp (E/kT) The pre-exponential factor R*, was hardly influenced by the humidity and decreased when the acidic protons were replaced with monovalent alkali cations. The activation energy of conduction was strongly affected by the degree of orientation and particle size of crystal with layered structure in a whole humidity region and increased by replacing the protons by alkali cations. © 1988 Chapman and Hall Ltd.
  • Humidity sensor composed of a microporous film of polyethylene-graft-poly-(2-acrylamido-2-methylpropane sulfonate), Y. Sakai, V. L. Rao, Y. Sadaoka, M. Matsuguchi, Polymer Bulletin, 19, 318, 1988/03, 01700839, 10.1007/BF00255390, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34250097054&origin=inward
  • Effects of sorbed water on the dielectric constant of some cellulose thin films, Y. Sadaoka, M. Matsuguchi, Y. Sakai, K. Takahashi, Journal of Materials Science Letters, 7, 2, 121, 124, 1988/02, 0261-8028, 10.1007/BF01730591, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023962122&origin=inward
  • Humidity sensor composed of a microporous film of polyethylene-graft-poly-(2-acrylamido-2-methylpropane sulfonate), Y. Sakai, V. L. Rao, Y. Sadaoka, M. Matsuguchi, Polymer Bulletin, 18, 501, 506, 1987/12, 01700839, 10.1007/BF00255333, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023592580&origin=inward, Inside a microporous polyethylene film, 2-acrylamido-2-methylpropane sulfonic acid was graft polymerized by ultraviolet irradiation. A humidity sensor was fabricated by depositing gold electrodes on both sides of the grafted film. The impedance was measured as a function of humidity for the acid and alkali salts of sulfonate. The sensor has long term stability and is resistant to water. © 1987 Springer-Verlag.
  • Humidity sensors using KH<inf>2</inf>PO<inf>4</inf>-doped porous (Pb, La)(Zr, Ti)O<inf>3</inf>, Y. Sadaoka, M. Matsuguchi, Y. Sakai, H. Aono, S. Nakayama, H. Kuroshima, Journal of Materials Science, 22, 10, 3685, 3692, 1987/10, 0022-2461, 10.1007/BF01161478, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023437224&origin=inward, Humidity sensing devices were prepared by using fine porous (Pb, La)(Zr, Ti)O3 (PLZT) particles with ferroelectricity instead of insulating metal oxides such as alumina and zircon. The impedance of PLZT with 1 wt %. KH2PO4 was 106 Ω and lower than that of zircon with 3.8 wt % KH2PO4 by a factor of 102 in a dry atmosphere. In addition, the impedance in a humid atmosphere was controlled by the adding of potassium dihydrogen phosphate and changed by about four orders of magnitude in the humidity region 0 to 90% relative humidity at 1 kHz for samples burnt at 700° C. The humidity dependence of impedance is mainly governed by the change of coverage of adsorbed water. The hydrophilicity is affected by the burning temperature and lanthanum content of PLZT used as starting particle for porous PLZT ceramics burnt with KH2PO4. From complex impedance analysis it is confirmed that the resistive component inserted in parallel with the capacitive component decreases steeply with an increase in humidity, while the capacitive component is poorly dependent on the humidity. © 1987 Chapman and Hall Ltd.
  • Electrical properties of zirconium bis(monohydrogen phosphate) monohydrate and its related compounds in a humid atmosphere, Y. Sadaoka, M. Matsuguchi, Y. Sakai, S. Mitsui, Journal of Materials Science, 22, 2975, 2982, 1987/08, 00222461, 10.1007/BF01086500, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023399685&origin=inward, Humidity-impedance characteristics were examined for amorphous and crystalline zirconium phosphate. The impedance of crystalline zirconium phosphate is lowered with decreasing particle size. While the impedance of amorphous zirconium phosphate increases steeply with an increase in the burning temperature, the impedance is poorly dependent on burning temperature for crystalline zirconium phosphate in a humid atmosphere. Fine-grained crystalline zirconium phosphate is a suitable material for use as a humidity sensing device because of its humidity sensitivity and response to humidity changes. The existence of amorphous phases is responsible for the increase in response time. © 1987 Chapman and Hall Ltd.
  • A Capacitive-type Relative Humidity Sensor Having a Double Layer Structure Consiting of a Photocrosslinked PVCA and a PMMA Film(jointly worked), Electrochemistry, 67, 2, 170, 174, 1999
  • Stability and reliability of capacitive-type relative humidity sensors using crosslinked polyimide films(jointly worked), Sensors and Actuators B, 52, 53, 57, 1998
  • Characterization of polymers for a capacitive-type humidity sensor based on water sorption behavior(jointly worked), Sensors and Actuators B, 49, 3, 179, 185, 1998
  • Sorption of CO<sub>2</sub> in the photocrosslinked PVCA film(jointly worked), Masanobu Matsuguchi, Jun-Ichi Miura, Yoshiro Sakai, Chemistry Letters, 3, 229, 230, 1998, 0366-7022|1348-0715, 10.1246/cl.1998.229
  • Solvatochromic study of water sorption in polymer films(jointly worked), Journal of Applied Polymer Science, 63, 12, 1681, 1691, 1997, 0021-8995, 10.1002/(SICI)1097-4628(19970321)63:12<1681::AID-APP18>3.0.CO;2-2
  • Humidity sensors based on polymer thin films(jointly worked), Sensors and Actuators B, 35, 1/3, 85, 90, 1996, 0925-4005, 10.1016/S0925-4005(96)02019-9
  • Effect of the Film Thickness on the Humidity Sensing Characteristics of Cross-linked PVCA Film(jointly worked), DENKI KAGAKU, 64, 10, 1107, 1112, 1996
  • Effect of the degree of cross-linking on the characteristics of a PVCA capacitive-type humidity sensor(jointly worked), Sensors and Actuators B, 34, 1/3, 349, 355, 1996, 0925-4005, 10.1016/S0925-4005(96)01826-6
  • Carbon Dioxide Sensor Using N, N-Dimethylaminoethyl Methacrylate and Methyl Methacrylate Copolymer(jointly worked), Sensors and Materials, 8, 2, 069-078, 1996
  • Competitive Adsorption of Water and CO<sub>2</sub> on Acetylene-Terminated Polymide Resins for a Humidity Sensor(jointly worked), DENKI KAGAKU, 63, 9, 841, 846, 1995
  • Preparation of Vitreous Sodium Aluminosilicate and Its Application as a Solid-State Electrochemical CO<sub>2</sub> Gas Sensor(jointly worked), Denki Kagaku, 63, 4, 325, 328, 1995
  • Capacitive-Type Humidity Sensors Using Polymerized Vinyl Caboxylate(jointly worked), Journal of the Electrochemical Society, 141, 3, 614, 618, 1994, 0013-4651, 10.1149/1.2054779
  • Effects of the Cross-Linking Structure on the Water Sorption Ability of Poly (vinyl carboxylate)(jointly worked), Bulletin of the Chemical Society of Japan, 67, 1, 46, 51, 1994, 0009-2673|1348-0634, 10.1246/bcsj.67.46
  • A Humidity Sensor Composed of Interpenetrating-polymer Networks of Hydrophilic and Hydrophobic Methacrylate Polymers(jointly worked), Journal of Electrochemical Society, 140, 2, 432, 436, 1993, 0013-4651, 10.1149/1.2221063
  • Effect of Heat Pretreatment on Electrical Conductance Changes by NO<sub>2</sub> Adsorption of Lead Phthalocyanine Thin Film(jointly worked), Journal of Materials Science, 27, 19, 5215, 5220, 1992, 0022-2461, 10.1007/BF02403819
  • Optical Humidity Sensor Using Reichardt's Betain Dye-Plymer Composites(jointly worked), CHEMISTRY LETTERS, 1, 53, 56, 1992, 0366-7022|1348-0715, 10.1246/cl.1992.53
  • Water Resistive Humidity Sensors(jointly worked), Polymer Applications, 40, 3, 30, 36, 1991
  • Optical Humidity Sensor Using Nafion-Dye Composite Thin Films(jointly worked), Yoshihiko Sadaoka, Masanobu Matsuguchi, Yoshiro Sakai, Yu-uki Murata, CHEMISTRY LETTERS, 4, 717, 720, 1991, 0366-7022|1348-0715, 10.1246/cl.1991.717

Other Research Activities

Awards & Honors

Research Grants & Projects

愛媛大学教員活動実績

教育活動(B)

論文指導(B07)

  • 2017, 9, 0, 9, 2, 0, 0, 0, 0

論文審査(B10)

  • 2017年, 2, 2, 0, 0
  • 2016年, 0, 5, 0, 0

学外非常勤(B11)

  • 2017年, 学校法人 すみれ学園 四国医療技術専門学校
  • 2017年, (独)国立高等専門学校機構 新居浜高専


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