纳米棒
材料科学
异质结
选择性
辐照
复合数
纳米颗粒
光电子学
化学工程
发光二极管
纳米技术
复合材料
化学
催化作用
物理
工程类
生物化学
核物理学
作者
Geyu Lu,Jing Xu,Jianbo Sun,Yang Yu,Yiqun Zhang,Fengmin Liu
标识
DOI:10.1016/j.snb.2011.12.039
摘要
ZnO/SnO2 composite materials are synthesized by hydrolyzing SnCl2 on ZnO nanorods via the wet chemical method. The gas sensing studies revealed that ZnO/SnO2 exhibits a high response to NO2 at room temperature under UV light emitting diode illumination. The highest response to NO2 was achieved by the ZnO/SnO2 composite 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 NO2 gas 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/SnO2 heterojunction model and the increased photo-generated electrons are proposed to elucidate the gas sensing mechanism.
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