【作者】：Geyu Lu, Jing Xu, Jianbo Sun, Yingshuo Yu, Yiqun Zhang, Fengmin Liu∗
【题目】：UV-enhanced room temperature NO2 sensor using ZnO nanorods modified with SnO2 nanoparticles
【关键词】：NO2 gas sensor,Room temperature,Semiconductor,UV light illumination
【版面信息】：Sensors and Actuators B: Chemical 162 (2012) 82-88
摘要:
ZnO/SnO2composite materials are synthesized by hydrolyzing SnCl2on ZnO nanorods via the wet chemical method. The gas sensing studies revealed that ZnO/SnO2exhibits a high response to NO2at room temperature under UV light emitting diode illumination. The highest response to NO2was achieved by the ZnO/SnO2composite with Zn and Sn molar ratio of 1:1 (ZS3). The resistance of sensor based on ZS3 with UV light stimulation changed 1266-fold to 500 ppb NO2gas at room temperature. Furthermore, the selectivity, as well as response and recovery properties, of the sensor was improved remarkably by UV light irradiation. The ZnO/SnO2heterojunction model and the increased photo-generated electrons are proposed to elucidate the gas sensing mechanism.
