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用于SO2气体检测的4A型分子筛掺杂碳纳米管气敏传感器研制

DOI: 10.13336/j.1003-6520.hve.2015.01.020, PP. 146-151

Keywords: SO2,SF6,局部放电,碳纳米管,分子筛,气敏传感器,气敏响应

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Abstract:

SO2作为SF6气体在局部放电作用下的重要特征分解组分,其体积分数大小和变化规律可用于判断SF6绝缘设备内局部放电的严重程度。为提高碳纳米管传感器对SO2气体的检测灵敏度,实现对SO2气体的快速实时检测,提出了一种分子筛掺杂碳纳米管制备气敏传感器的方法,研究了不同掺杂比例的传感器对体积分数为10-4的SO2气体的气敏响应特性,并对反应机理进行了初步探讨。结果表明与本征碳纳米管相比,4A分子筛掺杂制备出的碳纳米管气敏传感器对SO2的灵敏度有了显著提高,电阻变化率从0.96%最大提高至33.7%,并且传感器具有良好的重复性和稳定性,多次重复试验表明传感器电阻变化率保持稳定。研究结果为最终实现SF6气体绝缘设备中SO2气体的在线监测奠定了试验基础。

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