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CuO Thin Film/ZnO Nanorods Heterojunction Diode Structure for Efficient Detection of NO Gas

Authors:
Hwansu Yoo
Hyojin Kim
Soon-Ku Hong
Dojin Kim

Keywords: oxide heterostructure; gas sensor; p-n junction; zinc oxide; copper oxide

Abstract:
We report on the efficient detection of NO gas by an oxide semiconductor p-n heterojunction diode structure with n-type ZnO nanorods embedded in p-type CuO thin film, which was fabricated on an indium tin oxide-coated glass substrate by combining a hydrothermal synthesis method and a sputtering deposition method. The transport behavior and NO gas sensing properties of the hybrid CuO thin film/ZnO nanorods heterostructure were characterized. The oxide heterojunction structure exhibited a definite rectifying diode-like behavior at various temperatures ranging from room temperature to 250 oC. When the oxide p-n heterojunction diode structure was exposed to the acceptor gas NO in dry air, a significant decrease in the forward diode current was observed. The NO gas sensing response of the CuO thin film/ZnO nanorods heterostructure at 2 V was found to show a value as high as ~1,000% for the NO concentration of 10 ppm at a comparatively low operating temperature of 150 oC and increase linearly with increasing NO gas concentration in the range of 2-14 ppm. The experimental results indicate that this type of oxide heterostructure can be effectively used in various gas sensing applications thanks to its simple fabrication procedure and potential performance.

Pages: 10 to 12

Copyright: Copyright (c) IARIA, 2016

Publication date: April 24, 2016

Published in: conference

ISSN: 2519-836X

ISBN: 978-1-61208-523-4

Location: Venice, Italy

Dates: from April 24, 2016 to April 28, 2016