Gigantically enhanced NO sensing properties of WO3/SnO2 double layer sensors with Pd decoration

被引：44
作者：
Li, Hua-Yao [1 ]
Cai, Ze-Xing [1 ]
Ding, Jun-Chao [1 ]
Guo, Xin [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Lab Solid State Ion, Wuhan 430074, Hubei, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 220卷
关键词：
WO3; SnO2; Palladium; NO sensing; XPS; GAS SENSORS; WO3; OXIDE; SURFACE; PHOTOCATALYSIS; FILM; NANOSTRUCTURES; NANOPARTICLES; IMPROVEMENT; DIAGNOSIS;
D O I：
10.1016/j.snb.2015.05.091
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Five micrometers thick SnO2 bottom layer and 8 pin thick WO3 top layer were consecutively printed onto the Al2O3 substrate with Pt electrodes, and decoration with Pd nanoparticles was also applied to the WO3 top layer, thus sensors with the structure of Pt/SnO2/WO3(Pd) were fabricated. The NO sensing properties were characterized in the temperature range of 250 to 500 degrees C. When exposed to 200 ppm NO at 400 degrees C, the sensor achieved a response of 38, and the response and recovery time were only 20s and 37.5s, respectively. The WO3 top layer with Pd decoration ensured a good response to NO gas, and the SnO2 bottom layer accelerated the electron transport, therefore, enhancing the response and recovery speed dramatically. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：398 / 405
页数：8
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