H2S sensitivity study of polypyrrole/WO3 materials

Abstract In this work, a H 2 S sensor formed from hybrid of WO 3 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 WO 3 . It was found that PPy/WO 3 materials can complement the drawbacks of pure PPy and WO 3 to some extent. PPy/WO 3 materials with varies PPy mass percent (1%, 3%, 5%, 10%, 20%) had better reversibility than PPy, and also had higher sensitivity than WO 3 when operated at 90 °C. The sensing mechanism of PPy/WO 3 materials to H 2 S was presumed to be the synergism of PPy and WO 3 or the effect of p–n heterojunctions.

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