Template-free to fabricate highly sensitive and selective acetone gas sensor based on WO₃ microspheres

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• 作者：Yidong Zhang ; ^{zyd630@126.com} ; ^{zyd630@xcu.edu.cn} ; Weiwei He ; Hongxiao Zhao ; Pinjiang Li
• 关键词：Tungsten trioxide (WO3) ; Microspheres ; Acetone vapor ; Gas-sensor
• 刊名：Vacuum
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：95
• 期：Complete
• 页码：30-34
• 全文大小：678 K

文摘

In this paper, we described how WO₃ microspheres have been synthesized by a simple hydrothermal treatment from the precursor of Na₂WO₄ and CO (NH₂)₂ at 160?¡ãC for 3?h. The sample was characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), high resolution transmission electronic microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS). Obtained results indicated that the average diameter of the as-prepared WO₃ microspheres is ¡«1?¦Ìm with orthorhombic phase. The WO₃ microspheres are constructed of polycrystalline WO₃ nanoparticles. The thickness of the WO₃ coating of the gas sensor is ¡«2?¦Ìm. The WO₃-based gas sensor exhibited a good sensitivity and high selectivity to acetone vapor at 200?¡ãC. A possible mechanism for the acetone vapor gas sensing was proposed.