高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    

CuCl2修饰WO3对超低浓度H2S的高灵敏度检测

王斌,胡梦洁,李佩林,王文静,杨赢,朱连杰   

  1. 天津理工大学 化学化工学院
  • 收稿日期:2025-09-18 修回日期:2025-10-14 网络首发:2025-10-16 发布日期:2025-10-16
  • 通讯作者: 朱连杰 E-mail:zhulj@tjut.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(批准号: 22275140)资助

Highly Sensitive Detection on Trace H2S Gas over CuCl2 Modified WO3

WANG Bin#, HU Mengjie#, LI Peilin, WANG Wenjing, YANG Ying, ZHU Lianjie*   

  1. School of Chemistry & Chemical Engineering, Tianjin University of Technology
  • Received:2025-09-18 Revised:2025-10-14 Online First:2025-10-16 Published:2025-10-16
  • Contact: ZHU Lianjie E-mail:zhulj@tjut.edu.cn
  • Supported by:
    Supported by the National Natural Science foundation of China (No. 22275140)

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摘要： 采用溶剂热法合成了由纳米线构成的蜂窝状WO3，再分别与1%摩尔比的CuO或CuCl2混合并研磨处理后，得到CuO-WO3和Cu2+-WO3复合材料。对WO3、CuO-WO3和Cu2+-WO3样品的形貌、组成、价态及能带结构等进行了系统的表征，研究了其对H2S气体的传感性能。研究发现纯WO3对H2S气体的响应值较低，仅为2.8，而两种复合材料对H2S检测的灵敏度均显著提高，其中Cu2+-WO3传感器的响应值最高，为67.6，是纯WO3传感器的24.1倍，且该传感器可实现对超低浓度H2S气体（20 ppb）的有效检测，表明该传感器对H2S气体检测具有高灵敏度，这可能是由于（1）铜离子掺杂大大提高了WO3表面的电荷转移效率及分离程度；（2）较低的带隙能导致更多电子参与气体传感反应；（3）Cu2+与H2S之间发生氧化还原反应，从而大大提高了其气体传感性能。

关键词: WO3复合物, 铜离子掺杂, H2S, 气体传感, 传感机理

Abstract: The honeycomb-like porous WO3 assembled by nanowires was synthesized by a solvothermal method. After mixing and grinding with 1% molar ratio of CuO or CuCl2, the CuO-WO3 andCu2+-WO3composites 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. It was found 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 ppb, indicating its superior sensitivity for H2S detection. This might be due to (1) copper ion doping enhancing the charge transfer efficiency/separation, (2) narrowed band gap and (3) the redox reactions between the Cu2+ and H2S, leading significantly improving the gas sensing performance.

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

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