Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Electrical Conductivity, Flammable Gas Response and Humidity Effect of Pporous ZnO

다공질 ZnO의 전기적 특성, 환원성 가스 감응 특성 및 습도의 영향

  • 윤당혁 (포항공과대학교 재료금속공학과) ;
  • 최경만 (포항공과대학교 재료금속공학과)
  • Published : 1995.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The electrical conductivity, flammable gas response and their humidity effect of porous ZnO, added with 5wt% corn starch as the fugitive phase, were examined. Porous ZnO showed different conductivity curves during increasing and decreasing temperature, and its electrical conductivity decreased rapidly by desorption of OH- between 20$0^{\circ}C$ and 35$0^{\circ}C$ when the temperature increased in dry air. The CO gas sensitivity of starchadded ZnO samples was higher than that of ZnO without starch addition. The sensitivity of porous, starchadded ZnO to 200ppm CO gas was much less in humid atmosphere than in dry atmosphere since water vapor increased the conductivity of porous ZnO in air, but decreased the conductivity in CO. Maximum sensitivity to 200 ppm CO gas balanced by air was about 100 in dry atmosphere and about 15 in RH 23% atmosphere.

Keywords

References

  1. Sensors and Actuators v.2 Semiconductor Gas Sensors S. R. Morrison
  2. J.Electrochem.Soc. v.139 Solid State Gas Sensors;A Review A.M. Azad;S.A. Akbar;S.G. Mihaisalkar;L.D. Birkefeld;K.S. Goto
  3. J.Am.Ceram.Soc. v.59 Dependence of Electrical Conductivity of ZnO on Degree of Sintering M. Takata;D. Tsubone;H. Yanagida
  4. Sensors and Actuators v.18 Surface Process in the Detection of Reducing Gases with SnO₂Based Devices D. Kohl
  5. Solid State Ionics v.53;56 Solid State Sensors and Process Control C.B. Alcock
  6. J.Electrochem.Soc. v.136 Thick Film ZnO Resistive Gas Sensors S. Pizzini;N. Butta;D. Narducci;M. Palladino
  7. J.Am.Ceram.Soc. v.77 Factors Determining the Carbon Monoxide Sensing Properties of Tin Oxide Thick Films Calcined at Different Temperature K.H. Song;S.J. Park
  8. J Chem.Soc.Faraday Trans 1 v.83 Tin Dioxide Gas Sensors J.F. McAleer;P.T. Moseley;J.O.W. Norris;D.E. Williams
  9. Sensor Handbook S.H. Baek
  10. Sensors and Actuators v.5 The Effect of the Physical Form of the Oxide on the Conductivity Change Produced by CH₄,CO and H₂O on ZnO A. Jones;T.A. Jones;B. Mann;J.G. Firth
  11. Sensors and Actuators v.5 The Detection and Measurement of CO Using ZnO Single Crystals B. Bott;T.A. Jones;B. Mann
  12. Indian J.Pure Appl Phys v.5 Effect of Oxygen Chemisorption on the Electrical Conductivity of Zinc Oxide Single Crystal P. Chandra;U.B. Tare;A.P.B. Sinha
  13. Sensors and Actuators B v.18-19 The Influence of Water Vapour on Carbon Monoxide Sensitivity of α-Fe₂O₃Microporous Ceramic Sensors C. Cantalini;M. Faccio;G. Ferri;M. Pelino