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热电型气体传感器具有广阔的应用前景.然而在设计制备过程中,通常直接选用热电综合性能较好的材料作为反馈部件,缺乏对热电性能各参数的具体研究,因此在选材上至今尚缺足够的科学依据.本文采用固相反应法和射频磁控溅射技术,分别制备了不同化学配比的Ba1-xSrxPbO3(0≤x≤1)热电材料和对氢气敏感的Pt催化剂层,形成热电型氢气传感器.在相同氢气浓度下测试了各氢气传感器的输出电压,研究了热电参数对传感器性能的影响度.测量结果表明,热电材料的Seebeck值和热导率对热电氢气传感器性能起关键性作用.该研究为制备高性能热电型气体传感器的反馈部件提供了可靠的选材依据.以SrPbO3为反馈部件制备热电氢气传感器,其测试范围可弥补市售氢气传感器因测量范围窄难以满足GB15322的问题,可用于较高氢气浓度的测量和泄漏情况的安全评估.

参考文献

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