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1990 Fiscal Year Final Research Report Summary

Basic Research for Development of Ceramic Odor Sensors

Research Project

Project/Area Number 01470082
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 工業物理化学
Research InstitutionKyushu University

Principal Investigator

YAMAZOE Noboru  Kyushu Univ. Graduate School of Eng. Sci. Prof., 大学院・総合理工学研究科, 教授 (40037817)

Co-Investigator(Kenkyū-buntansha) TAMAKI Jun  Kyushu Univ. Graduate School of Eng. Sci. Research Associate, 大学院・総合理工学研究科, 助手 (10207227)
SHIMIZU Youichi  Kyushu Univ. Graduate School of Eng. Sci. Research Associate, 大学院・総合理工学研究科, 助手 (20192114)
MIURA Norio  Kyushu Univ. Graduate School of Eng. Sci. Associate. Prof., 大学院・総合理工学研究科, 助教授 (70128099)
Project Period (FY) 1989 – 1990
KeywordsSemiconductor Gas Sensor / Microstructure Control / Surface Modification / Odor Sensor
Research Abstract

Sensing properties of semiconductor gas sensor were extensively improved by microstructrure control and by surface modification. A new design concept of semiconductor gas sensor was constructed in the present research.
The sensitivity of snO_2 gas sensor was enhanced by controlling crystallite size (D) and thickness of space charge layer (L) of SnO_2 and the dispersion state of Pd promoter. The sensitivity increased with decreasing D close to 2L (=ca. 6 nm for pure SnO_2), while for Al^<3+>-doped SnO_2 it was very high even at large D because the doping brings about large L values. Therefore it was found that the sensitivity could be promoted when D/2L was controlled to be close to unity or less. On the other hand, the sensitivity of Pd-SnO_2 sensor was enhanced by highly dispersing small Pd particles on SnO_2 surface. The Pd complex fixation method was found to be the most excellent method to obtain the high dispersion of Pd particle.
The improvement of the selectivity was attained by modifying the SnO_2 surface using foreign oxide additives. The sensitivity of SnO_2 gas sensor to ethanol gas was enhanced by adding basic oxide such as La_2O_3, probably because the oxidation of C_2H_5OH via dehydrogenation through CH_3CHO intermediate proceed favorably on the basic surface. Similar results were obtained for Pd-La_2O_3-In_2O_3 element effectively. On the other hand, CuO was a unique additives to enhance sensing properties of SnO_2 element to H_2S. CuO-SnO_2 element showed the extraordinary high sensitivity and selectivity, and switching-like recovery response on turning off H_2S. The change of state between CuO and CuS was found to be responsible for such unique sensing properties.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Shigenori MATSUSHIMA: "Role of Additives on Alcohol Sensing by Semiconductor Gas Sensor" Chemistry Letters. 1989. 845-848 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigenori MATSUSHIMA: "TEM Observation of the Dispersion State of Pd on SnO_2" Chemistry Letters. 1989. 1651-1654 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chaonan XU: "Promoting Effects of Additives on Thermal Stability of Tin Oxide (IV) Fine Particles" Journal of Materials Science Letters. 8. 1092-1094 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jun TAMAKI: "Adsorption Bhhavior of CO and Interfering Gases on SnO_2" Surface Science. 221. 183-196 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jun TAMAKI: "Ethanol Gas Sensing Properties of PdーLa_2O_3ーIn_2O_3 Thick Film Element" Chemistry Letters. 1990. 477-480 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jun TAMAKI: "Conductivity Change of SnO_2 with CO_2 Adsorption" Chemistry Letters. 1990. 1243-1246 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chaonan XU: "Relationship Between Gas Sensitivity and Microstructure pf Porous SnO_2" Journal of Electrochemical Socient of Japan. 58. 1143-1148 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tomoki MAEKAWA: "Sensing Behavior of CuOーSnO_2 Element for H_2S Detection" Chemistry Letters. 1991. 575-578 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Matsushima, T. Maekawa, J. Tamaki, N. Miura, and N. Yemazoe: ""Role of additives on alcohol sensing by semiconductor gas sensor"" Chem. Lett.1989. 845-848 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Matsushima, J. Tamaki, N. Miura, and N. Yamazoe: ""TEM observation of the dispersion state of Pd on SnO_2"" Chem. Lett.1989. 1651-1654 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C. Xu, J. Tamaki, N. Miura, and N. Yamazoe: ""Promoting effects of additives on thermal stability of tin oxide (IV) fine particles"" J. Mater. Sci. Lett.8. 1092-1094 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Tamaki, M. Nagaishi, Y. Teraoka, N. Miura, N. Yamazoe, K. Moriya, and Y. Nakamura: ""Adsorption behavior of CO and interfering gases on SnO_2"" Surf. Sci.221. 183-196 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Tamaki, T. Maekawa, S. Metsushima, N. Miura, and N. Yamazoe: ""Ethanol gas sensing properties of Pd-La_2O_3-In_2O_3 thick film element"" Chem. Lett.1990. 477-480 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Tamaki, M. Akiyama, C. Xu, N. Miura, and N. Yamazoe: ""Conductivity Change of SnO_2 with CO_2 Adsorption"" Chem. Lett.1990. 1243-1246 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C. Xu, J. Tamaki, N. Miura, and N. Yamazoe: ""Relationship between gas sensitivity and Microstructrue of porous SnO_2"" J. Electrochem. Soc. Jpn.58. 1143-1148 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Maekawa, J. Tamaki, N. Miura, and N. Yamazoe: ""Sensing behavior of CuO-loaded SnO_2 element for H_2S detection"" Chem. Lett.1991. 575-578 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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