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학술지 Highly Sensitive Hydrogen Detection of Catalyst-Free ZnO Nanorod Networks Suspended by Lithography-Assisted Growth
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저자
허정환, 박종혁, 김규태, 박정영
발행일
201102
출처
Nanotechnology, v.22 no.5, pp.1-7
ISSN
0957-4484
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/0957-4484/22/8/085502
협약과제
10MB3100, 모바일 플렉시블 입출력 플랫폼, 조경익
초록
We have successfully demonstrated a ZnO nanorod-based 3D nanostructure to show a high sensitivity and very fast response/recovery to hydrogen gas. ZnO nanorods have been synthesized selectively over the pre-defined area at relatively low temperature using a simple self-catalytic solution process assisted by a lithographic method. The conductance of the ZnO nanorod device varies significantly as the concentration of the hydrogen is changed without any additive metal catalyst, revealing a high sensitivity to hydrogen gas. Its superior performance can be explained by the porous structure of its three-dimensional network and the enhanced surface reaction of the hydrogen molecules with the oxygen defects resulting from a high surface-to-volume ratio. It was found that the change of conductance follows a power law depending on the hydrogen concentration. A Langmuir isotherm following an ideal power law and a cross-over behavior of the activation energy with respect to hydrogen concentration were observed. This is a very novel and intriguing phenomenon on nanostructured materials, which suggests competitive surface reactions in ZnO nanorod gas sensors. © 2011 IOP Publishing Ltd.
KSP 제안 키워드
3D nanostructure, Activation Energy, Assisted growth, Enhanced surface, Fast response/recovery, High Sensitivity, Highly sensitive, Hydrogen concentration, Hydrogen molecules, Langmuir isotherm, Lithographic method