Low-Temperature H2S Detection with Hierarchical Cr-Doped WO3 Microspheres

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• 作者：Yanrong Wang ; Bin Liu ; Songhua Xiao ; Xinghui Wang ; Leimeng Sun ; Han Li ; Wuyuan Xie ; Qiuhong Li ; Qing Zhang ; Taihong Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：8
• 期：15
• 页码：9674-9683
• 全文大小：629K
• 年卷期：0
• ISSN：1944-8252

文摘

Hierarchical Cr-doped WO₃ microspheres have been successfully synthesized for efficient sensing of H₂S gas at low temperatures. The hierarchical structures provide an effective gas diffusion path via well-aligned micro-, meso-, and macroporous architectures, resulting in significant enhancement in sensing response to H₂S. The temperature and gas concentration dependence on the sensing properties elucidate that Cr dopants remarkably improve the response and lower the sensor’ operating temperature down to 80 °C. Under 0.1 vol % H₂S, the response of Cr-doped WO₃ sensor is 6 times larger than pristine WO₃ sensor at 80 °C. We suggest the increasing number of oxygen vacancies created by Cr dopants to be the underlying reason for enhancement of charge carrier density and accelerated reactions with H₂S.