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Highly-sensitive H2 sensor operating at room temperature using PtTiO2 nanoscale Schottky contacts.pdf

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Highly-sensitive H2 sensor operating at room temperature using PtTiO2 nanoscale Schottky contacts.pdf

Sensors and Actuators B 241 (2017) 985–992 Contents lists available at ScienceDirect Sensors and Actuators B: Chemical journal homepage: /locate/snb Highly-sensitive H2 sensor operating at room temperature using Pt/TiO2 nanoscale Schottky contacts Hyunah Kwon, Yuna Lee, Sunyong Hwang, Jong Kyu Kim ? Department of Materials Science and Engineering, POSTECH, Pohang 790-784, Republic of Korea article info Article history: Received 5 September 2016 Received in revised form 25 October 2016 Accepted 4 November 2016 Available online 5 November 2016 Keywords: Hydrogen sensor Nanoscale Schottky contact Room temperature abstract Despite growing demands for high performance hydrogen (H2) sensors operating at low temperature, metal oxides-based H2 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 H2 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 H2 adsorption on the catalytic Pt layer, followed by the dipole layer formation at the junction. Our device showed very high H2 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 con?guration making effective current modulation. Based on our results, we propose Schottky contact-assisted H2 sensing mechanisms and a promising approach to further improve H2 sensing performance at room temperature. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction Hydrogen (H2) holds the promise for great contributions to sustainable development, because it is environmentally benign, clean, and renewable [1]. However, H2 gas is highly ?ammable and explosive at volume concentration higher than 4%