Electrical conduction and NO2 gas sensing properties of ZnO nanorods

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) co...

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Bibliographic Details
Published in:Applied surface science 2014-06, Vol.303, p.90-96
Main Authors: SAHIN, Yasin, ÖZTÜRK, Sadullah, KILIC, Necmettin, KÖSEMEN, Arif, ERKOVAN, Mustafa, ÖZTÜRK, Zafer Ziya
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Electrodes
Exact sciences and technology
Exposure
Gas sensors
Heating rate
Indium tin oxide
Nanorods
Nitrogen dioxide
Physics
Zinc oxide
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Summary: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 degree C. For gas sensing measurements, ZnO nanorods were exposed to NO2 (100ppb to 1ppm) 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.02.083