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Mechanosynthesis and gas-sensing properties of In_2O_3/SnO_2 nanocomposites

机译：In_2O_3 / SnO_2纳米复合材料的机械合成和气敏特性

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摘要

We report the successful synthesis of 30 wt percent In_2O_3/SnO_2 nanocomposites by heating the precursor obtained via a mechanochemical reaction, and investigate their gas-sensing properties. The samples were characterized by means of x-ray diffraction, scanning electron microscopy and x-ray photoelectron spectroscopy. Subsequent thermal treatment of the precursor for 2 h in air at 700 deg C resulted in the formation of In_2O_3/SnO_2 nanocomposites with an average crystal size of about 22 nm. In comparison to pure SnO_2, the gas sensor fabricated from the as-synthesized In_2O_3/SnO_2 nanocomposites has an excellent gas-sensing performance, such as high sensitivity (93 for 1000 ppm C_2H_5OH), a rapid response rate (within 5 s for 90 percent response and recovery times) and high selectivity to ethanol. To explain the enhanced sensitivity of the In_2O_3/SnO_2 gas sensor, the gas-sensing mechanism is discussed.
机译：我们报告通过加热通过机械化学反应获得的前体成功合成了30 wt％In_2O_3 / SnO_2纳米复合材料，并研究了它们的气敏特性。通过X射线衍射，扫描电子显微镜和X射线光电子能谱对样品进行表征。随后在700摄氏度的空气中对前驱物进行2小时的热处理，导致形成In_2O_3 / SnO_2纳米复合材料，其平均晶体尺寸约为22 nm。与纯SnO_2相比，由合成后的In_2O_3 / SnO_2纳米复合材料制成的气体传感器具有出色的气体传感性能，例如高灵敏度（对于1000 ppm C_2H_5OH，灵敏度为93），快速响应速度（在90％的5秒内）响应和恢复时间）和对乙醇的高选择性。为了说明In_2O_3 / SnO_2气体传感器的灵敏度提高，讨论了气体传感机理。

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