Journal
SOLID-STATE ELECTRONICS
Volume 50, Issue 5, Pages 723-726Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sse.2006.04.024
Keywords
H2S; gas sensitivity; polypyrrole; WO3
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In this work, a H2S sensor formed from hybrid of WO3 and polypyrrole (PPy) by mechanical mixing was produced. The gas-sensing properties of the hybrid materials were studied and compared with those of PPy and WO3. It was found that PPY/WO3 materials can complement the drawbacks of pure PPy and WO3 to Some extent. PPY/WO3 materials with varies PPy mass percent (1%, 3%, 5%, 10%, 20%) had better reversibility than PPy, and also had higher sensitivity than WO3 when operated at 90 degrees C. The sensing mechanism of PPy/WO3 materials to H2S was presumed to be the synergism of PPy and WO3 or the effect of p-n heterojunctions. (c) 2006 Elsevier Ltd. All rights reserved.
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