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An array of metal oxides nanoscale hetero p-n junctions toward designable and highly-selective gas sensors

Title
An array of metal oxides nanoscale hetero p-n junctions toward designable and highly-selective gas sensors
Authors
KWON, HYUNAHYOON, JUN SIKYuna LeeDONG, YEONG KIMBAEK, CHANG KIKIM, JONG KYU
POSTECH Authors
BAEK, CHANG KIKIM, JONG KYU
Date Issued
Feb-2018
Publisher
ELSEVIER SCIENCE SA
Abstract
Nano-helical array of p-NiO/n-SnO2 p-n junctions with well-defined and highly-gas-accessible hetero-interfaces is presented for designable and highly selective gas sensors. The gas sensor having the nanoscale p-n junction sensing layer with a top-and-bottom electrodes configuration was fabricated by conventional photolithography and oblique-angle deposition. The unique device structure enables a predominant modulation in barrier height at the hetero-interfaces, consistent with simulation results, resulting in unusual-yet-promising sensing behaviors upon H-2 and NO2 exposure. Based on our experimental and simulation results, and the ability to fabricate a variety combination of metal oxides heterostructures with a reproducible and controllable way, we believe that it becomes possible to design and realize highly-selective sensor array electronic-noses optimized towards target gases on demand. (C) 2017 Elsevier B.V. All rights reserved.
Keywords
Metal oxide; Gas sensor; Nanoscale p-n junction; Electronic noses; Oblique-angle deposition
URI
http://oasis.postech.ac.kr/handle/2014.oak/38937
DOI
10.1016/j.snb.2017.08.173
ISSN
0925-4005
Article Type
Article
Citation
SENSORS AND ACTUATORS B-CHEMICAL, vol. 255, page. 1663 - 1670, 2018-02
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 KIM, JONG KYU
Dept of Materials Science & Enginrg
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