Electrical conduction and NO2 gas sensing properties of ZnO nanorods

被引：53
|
作者：
Sahin, Yasin [1 ]
Ozturk, Sadullah [2 ]
Kilinc, Necmettin [2 ,3 ]
Kosemen, Arif [2 ,4 ]
Erkovan, Mustafa [5 ]
Ozturk, Zafer Ziya [2 ,6 ]
机构：
[1] Council Forens Med, TR-34196 Istanbul, Turkey
[2] Gebze Inst Technol, Fac Sci, Dept Phys, TR-41400 Gebze, Kocaeli, Turkey
[3] Koc Univ, Dept Elect & Elect Engn, TR-34450 Istanbul, Turkey
[4] Mus Alparslan Univ, Dept Phys, TR-49100 Mus, Turkey
[5] SAKARYA Univ, Fac Engn, Dept Met & Mat Engn, TR-54187 Sakarya, Turkey
[6] TUBITAK Marmara Res Ctr, Mat Inst, TR-41470 Gebze, Kocaeli, Turkey
来源：
APPLIED SURFACE SCIENCE | 2014年 / 303卷
关键词：
ZnO; Nanorods; Hydrothermal process; TSC; VRH; NO2; sensor; Photoresponse; THERMALLY STIMULATED CURRENT; OXIDE ELECTRODES; THIN-FILMS; GROWN ZNO; TEMPERATURE; TRANSPORT; MECHANISM; NANOSTRUCTURES; NANOWIRES; SENSOR;
D O I：
10.1016/j.apsusc.2014.02.083
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Thermally stimulated current (TSC), photoresponse and gas sensing properties of zinc oxide (ZnO) nanorods were investigated depending on heating rates, illumination and dark aging times with using sandwich type electrode system. Vertically aligned ZnO nanorods were grown on indium tin oxide (ITO) coated glass substrate by hydrothermal process. TSC measurements were performed at different heating rates under constant potential. Photoresponse and gas sensing properties were investigated in dry air ambient at 200 degrees C. For gas sensing measurements, ZnO nanorods were exposed to NO2 (100 ppb to 1 ppm) in dark and illuminated conditions and the resulting resistance transient was recorded. It was found from dark electrical measurements that the dependence of the dc conductivity on temperature followed Mott's variable range hopping (VRH) model. In addition, response time and recovery times of ZnO nanorods to NO2 gas decreased by exposing to white light. (C) 2014 Elsevier B. V. All rights reserved.
引用
收藏
页码：90 / 96
页数：7
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