期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 240, 期 -, 页码 426-433出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.08.177
关键词
WO3 nanoplates; Hydrothermal method; NO2 gas sensor; Sensitivity
资金
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20124010203180]
- Science and Engineering Research Board (SERB) [SR/FTP/PS-083/2012]
- Department of Science and Technology (DST), New Delhi, India
- Defense Research and Development Organization (DRDO), New Delhi, India [DRDO/ERIP/ER/0803719/M/01/134]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20164030201310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Gas sensors based on a chemiresistive metal oxide semiconductor are widely used including nitrogen dioxide (NO2) at a moderate temperature. In this work efforts are taken to fabricate NO2 gas sensor using thin films of tungsten oxide (WO3) grown directly on to a soda-lime glass substrate without assistance of any seed layer by a simple and a facile hydrothermal technique. As per our knowledge, the deposition of nanostructured WO3 thin films without assistance of any seed layer on the glass substrate was rarely reported. The WO3 thin film samples were synthesized at various deposition times ranging from 3 h to 7 h and were characterized by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, UV-vis spectroscopy and Brunauer-Emmett-Teller techniques. The surface morphological and structural characterization showed the two dimensional (2D) nanoplate-like structure of as synthesized WO3 thin films with plate thickness ranging from 90 to 150 nm and had an orthorhombic structure, respectively. Moreover, the 2D nanoplates of WO3 exhibited a gas response 10 for 5 ppm for toxic NO2 gas at relatively low operating temperature. The new synthesis route and sensing behavior of as synthesized WO3 nanoplates revealed a promising candidate for the fabrication of the cost effective gas sensors. (C) 2016 Elsevier B.V. All rights reserved.
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