Highly Sensitive Detection on Trace H2S Gas over CuCl2-modified WO3

doi:10.7503/cjcu20250267

Abstract

Abstract:

The honeycomb-like porous WO₃ assembled by nanowires was synthesized by solvothermal method. After mixing and grinding with 1%（molar ratio to WO₃） of CuO or CuCl₂， the CuO-WO₃ and Cu²⁺-WO₃ composites were obtained. The morphology， composition， valence state and energy band structure etc. of the WO₃， CuO-WO₃ and Cu²⁺-WO₃ samples were characterized systematically and their gas sensing performances to H₂S were studied. The results showed that the response value of the pure WO₃ was rather low， only 2.8， while the sensitivities of the two composite sensors were significantly increased. Among the three sensors， the Cu²⁺-WO₃ sensor had the highest response value to H₂S， 67.6， which is 24.1 times that of the pure WO₃ sensor. Moreover， the Cu²⁺-WO₃ sensor can effectively detect extremely low concentration of H₂S gas， 20 μg/kg， indicating its superior sensitivity for H₂S detection. This might be due to copper ion doping enhancing the charge transfer efficiency/separation， narrowed band gap and the redox reactions between the Cu²⁺ and H₂S， leading to significantly improved H₂S sensing performance.

Key words: WO₃ composite, Cu²⁺ ion doping, H₂S, Gas sensing, Sensing mechanism

CLC Number:

O614

TrendMD:

WANG Bin, HU Mengjie, LI Peilin, WANG Wenjing, YANG Ying, ZHU Lianjie. Highly Sensitive Detection on Trace H₂S Gas over CuCl₂-modified WO₃[J]. Chem. J. Chinese Universities, 2025, 46(12): 20250267.

Figures/Tables 7

References 29

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Highly Sensitive Detection on Trace H₂S Gas over CuCl₂-modified WO₃

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