Gas Sensing Properties of Hydrothermally Synthesized Button Rose-Like WO3 Thin Films
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In this paper, we have synthesized the WO3 button rose-like morphology directly grown on glass substrate using NaOH as an etching agent by hydrothermal method at 100°C. The formation of the WO3 button rose and its structural, optical, surface morphological and electrical properties were studied by various characterization techniques. The button rose-like morphology and orthorhombic crystal structure were confirmed by scanning electron microscopy (SEM) and x-ray diffraction techniques (XRD), respectively. The optical spectroscopy measurements reveal the band gap energy of WO3 button rose-like morphology varied between 2.2 and 2.4 eV. It is seen that the button rose-like morphology plays a crucial role in gas sensing properties. The as-synthesized WO3 button rose shows a gas response of about 262% at 6 ppm of NO2 gas. Particularly, this gas sensor shows better gas sensitivity towards NO2 gas than the other gases. Because of the high value of gas sensitivity, the reported WO3 with button rose-like morphology could be a suitable candidate for NO2 sensing.
KeywordsWO3 button rose hydrothermal method Etching agent: NaOH NO2 gas sensor
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This work was partially supported by the Human Resources Development Program (No. 20164030201310) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korea, Government Ministry of Trade, Industry and Energy.
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