Highly-sensitive H2 sensor operating at room temperature using Pt/TiO2 nanoscale Schottky contacts
SCIE
SCOPUS
- Title
- Highly-sensitive H2 sensor operating at room temperature using Pt/TiO2 nanoscale Schottky contacts
- Authors
- KWON, HYUNAH; Lee, Y; Hwang, S; Kim, J.K.
- Date Issued
- 2017-03
- Publisher
- Elsevier
- Abstract
- Despite growing demands for high performance hydrogen (H-2) sensors operating at low temperature, metal oxides-based H-2 sensors intrinsically require an elevated operating temperature due to a high activation energy for gas adsorption on metal oxides surface. Here, we present a highly-sensitive H-2 sensor operating even at room temperature, enabled by the Pt/TiO2 nanoscale Schottky contacts which utilizes sensitive modulation of the Schottky barrier height by dissociative H-2 adsorption on the catalytic Pt layer, followed by the dipole layer formation at the junction. Our device showed very high H-2 response and short response and recovery times at low temperatures which are attributed to the unique device architecture having the highly-porous nanoscale Schottky contacts facilitating the gas diffusion and dissociation, and the top-and-bottom electrodes configuration making effective current modulation. Based on our results, we propose Schottky contact-assisted H-2 sensing mechanisms and a promising approach to further improve H-2 sensing performance at room temperature. (C) 2016 Elsevier B.V. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36712
- DOI
- 10.1016/J.SNB.2016.11.022
- ISSN
- 0925-4005
- Article Type
- Article
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, vol. 241, page. 985 - 992, 2017-03
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