UV-enhanced room temperature NO2 sensor using ZnO nanorods modified with SnO2 nanoparticles

被引：243

作者：

Lu, Geyu ^{[1
]}

Xu, Jing ^{[1
]}

Sun, Jianbo ^{[1
]}

Yu, Yingshuo ^{[1
]}

Zhang, Yiqun ^{[1
]}

Liu, Fengmin ^{[1
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2012年 / 162卷 / 01期

关键词：

NO2 gas sensor; Room temperature; Semiconductor; UV light illumination; GAS-SENSING PROPERTIES; TIN-OXIDE; LIGHT; HUMIDITY; SURFACE; FILMS; DC;

D O I：

10.1016/j.snb.2011.12.039

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

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. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：82 / 88

页数：7

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