An array of metal oxides nanoscale hetero p-n junctions toward designable and highly-selective gas sensors
SCIE
SCOPUS
- Title
- An array of metal oxides nanoscale hetero p-n junctions toward designable and highly-selective gas sensors
- Authors
- KWON, HYUNAH; YOON, JUN SIK; Yuna Lee; DONG, YEONG KIM; BAEK, CHANG KI; KIM, JONG KYU
- Date Issued
- 2018-02
- 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.
- URI
- https://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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