The coupled effect of oxygen vacancies and Pt on the photoelectric response of tungsten trioxide films

被引：43
作者：
Yang, Chaoqun [1 ]
Zhu, Qiang [1 ]
Lei, Tao [1 ]
Li, Huayao [1 ]
Xie, Changsheng [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Dept Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Nanomat & Smart Sensors Res Lab, Wuhan 430074, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2014年 / 2卷 / 44期
关键词：
WO3; PHOTOCATALYSIS; LIGHT; TIO2; UV; PHOTORESPONSE; PHOTOCURRENT; PERFORMANCE; COMPOSITE; MOLECULES;
D O I：
10.1039/c4tc01150c
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, four kinds of WO3 films, namely, Pt-loaded hydrogenated WO3, Pt-loaded WO3, and hydrogen-treated and untreated WO3 films were synthesized and their photoelectric properties were investigated at room temperature. The quantitative results showed that the gas-sensitized WO3 film in formaldehyde exhibited much higher photocurrent than that in air. In addition, the sensitivity of Pt-loaded hydrogenated WO3 to formaldehyde reached 15.8 which was nearly 15 times higher than that of the others. Moreover, Pt-loaded hydrogenated WO3 shows excellent electrical response towards formaldehyde in the dark. The intriguing performance of the Pt-loaded hydrogenated WO3 film indicates an efficient coupled effect of oxygen vacancies and Pt. The results provide the potential for improving the efficiency of photoelectric sensing devices by coupling two modification mechanisms. To explain the response characteristics of the four kinds of WO3 films, a schematic diagram of the band bending and spill over model are proposed.
引用
收藏
页码：9467 / 9477
页数：11
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