Porous Hierarchical In2O3 Micro-/Nanostructures: Preparation, Formation Mechanism, and Their Application in Gas Sensors for Noxious Volatile Organic Compound Detection

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• 作者：Jinyun Liu ; Tao Luo ; Fanli Meng ; Kai Qian ; Yuteng Wan ; Jinhuai Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：March 25, 2010
• 年：2010
• 卷：114
• 期：11
• 页码：4887-4894
• 全文大小：368K
• 年卷期：v.114,no.11(March 25, 2010)
• ISSN：1932-7455

文摘

A porous hierarchical In₂O₃ micro-/nanostructure was prepared by oxidizing In₂S₃ precursors for gas sensor applications. The formation mechanism of the porous structure was investigated systemically by means of simultaneous thermogravimetry and differential thermal analysis, conventional X-ray diffraction, and energy-dispersive XRD cooperated with field-emission scanning electronic microscopy observations. In gas-sensing measurements with noxious volatile organic compounds as target gases, the gas sensor based on porous hierarchical In₂O₃ micro-/nanostructures showed a sensitive performance with a large detecting concentration range. Besides, the as-fabricated gas sensor also exhibited significant selectivity toward each target gas. Both the sensitivity and the selectivity of the porous hierarchical In₂O₃ micro-/nanostructure-based gas sensor enable it to be potentially applied for environmental monitoring toward noxious volatile organic compounds. Furthermore, the gas-sensing mechanism was also demonstrated from the kinetic process of gas adsorption−desorption.