Preparation and gas sensitivity of WO3 hollow microspheres and SnO2 doped heterojunction sensors

被引：36

作者：

Gui, Yanghai ^{[1
,2
]}

Dong, Fanghong ^{[3
]}

Zhang, Yonghui ^{[1
]}

Zhang, Yong ^{[2
]}

Tian, Junfeng ^{[1
]}

机构：

[1] Zhengzhou Univ Light Ind, Henan Prov Key Lab Surface & Interface Sci, Zhengzhou 450002, Peoples R China

[2] Zhengzhou Univ Light Ind, Res Lab Funct Mat, Zhengzhou 450002, Peoples R China

[3] Zhengzhou Vocat Coll Ind Safety, Zhengzhou 451192, Peoples R China

来源：

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING | 2013年 / 16卷 / 06期

基金：

中国国家自然科学基金;

关键词：

WO3; WO3/SnO2; Microwave synthesis; Gas sensor; THIN-FILMS; MECHANISM; HUMIDITY; SINGLE;

D O I：

10.1016/j.mssp.2013.05.012

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Dispersed tungsten trioxide (WO3) microsphere aggregates were prepared by chemical reduction with hydrazine hydrate in a glycol-water system, and the composites of WO3/ tin oxide (SnO2) with different SnO2 weight fractions were prepared by microwave refluxing. The products were characterized by x-ray diffraction, field emission scanning electron microscopy, thermogravimetric-differential thermal analysis, Fourier transform infrared spectroscopy, and the Brunauer-Emmett-Teller method. The gas-sensing characteristics based on the composites were investigated by a stationary-state gas distribution method. The results show that the noncompact WO3 microspheres with hollow structure were obtained. The phase composition and the morphology of WO3 were changed by SnO2 doping. The heterojunction structure was formed between WO3 and SnO2, and the heterojunction sensors have high sensitivity to H2S, NOx, and xylene at relatively lower operating temperature, especially the sensor doped by 3% SnO2 operating just at 90 degrees C for H2S gas. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：1531 / 1537

页数：7

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