Temperature-humidity Dependence and Stability of SnO<sub>2</sub>-based CO Gas Sensors Improved by Surface Modification with Platinum and Iridium

DOI Web Site Web Site 1 Citations 47 References

Bibliographic Information

Other Title
  • Temperature-humidity Dependence and Stability of SnO2-based CO Gas Sensors Improved by Surface Modification with Platinum and Iridium

Search this article

Abstract

<p>A novel method to modify the surfaces of SnO2-based CO gas sensors in order to improve their temperature and humidity dependence has been developed. This surface modification is accomplished by dipping the sensor element in a dilute aqueous solution containing platinum and/or iridium for only a few seconds, then heating it at 600℃ for 5 min. This simple method effectively suppresses variations in sensor resistance to temperature and humidity in a specific concentration of CO; a decrease in sensor resistance with lowering temperature and humidity is prevented by the surface modifications with platinum and/or iridium. This effect is more enhanced by using both platinum and iridium than by using either metal individually. Moreover, preliminary surface treatments with sulfuric acid and thiourea further reduce the temperature and humidity dependence of sensor resistance in CO. It has been also proven that the modification of the SnO2-based CO gas sensor's surface using mixed elements results in its excellent long-term stability.</p>

Journal

  • Electrochemistry

    Electrochemistry 68 (9), 694-701, 2000-09-05

    The Electrochemical Society of Japan

Citations (1)*help

See more

References(47)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top