Original Research ARTICLE
Improving hydrogen sensing performance of TiO2 nanotube arrays by ZnO modification
- 1University of Science and Technology of China, China
In this work, anodization was utilized to synthesize highly ordered TiO2 nanotube arrays, and ZnO was successfully decorated onto the surface of as-prepared TiO2 nanotubes via a facile impregnation method. The gas sensing performance of TiO2@ZnO composite was systematically studied. At a working temperature of 300 °C, the response of TiO2@ZnO to 100 ppm H2 was ~340, 2.7 times larger than that of pristine TiO2. A power-law relationship between the response and H2 concentration was observed. In addition, the response time was significantly reduced by four times, and improved selectivity to H2 was achieved. The highly improved sensing performance of TiO2 nanotubes by ZnO decoration may be attributed to the enhanced oxygen adsorption and formation of n-n heterojunctions.
Keywords: Hydrogen sensor, semiconductor, TiO2 Nanotubes, Heterojunction, Anodic Oxidation
Received: 28 Jan 2019;
Accepted: 01 Apr 2019.
Edited by:Xiaogan Li, Dalian University of Technology (DUT), China
Reviewed by:Han Jin, Ningbo University, China
Alexander Gaskov, Lomonosov Moscow State University, Russia
Copyright: © 2019 Yu, Xun and Yi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Jianxin Yi, University of Science and Technology of China, Hefei, 230026, Anhui Province, China, firstname.lastname@example.org