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首页> 外文期刊>Sensors and Actuators >SnO_2-based R134a gas sensor: Sensing materials preparation, gas response and sensing mechanism
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SnO_2-based R134a gas sensor: Sensing materials preparation, gas response and sensing mechanism

机译：基于SnO_2的R134a气体传感器：传感材料的制备，气体响应和传感机制

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摘要

Undoped SnO_2 and porous AI_2O_3 powders were obtained through a simple chemical precipitation process. SnO_2-based gas sensing materials and Al_2O_3 catalytic coating loaded with a noble metal were prepared by impregnation. The SnO_2 and AI_2O_3 powders were characterized by TEM, SEM, nitrogen adsorption-desorption experiment, FT-IR and in situ XRD. Gas responses of the SnO_2-based gas sensors were measured in a static state. The experimental results indicated that the response towards R134a of the SnO_2-based gas sensor can be significantly enhanced by loading noble metal and using catalytic coating. The sensor based on a double layer film SnO_2 (Au)/Al_2O_3 (Au) showed satisfactory results including large response, good selectivity, high long-term stability, fast response and recovery, revealing its potential application in the detection of refrigerants and the maintenance of air condition systems. Finally, a gas sensing mechanism for Rl 34a is suggested and proved by bond energy data, FT-IR spectrum and in situ XRD.
机译：通过简单的化学沉淀过程获得了未掺杂的SnO_2和多孔的AI_2O_3粉末。通过浸渍制备了SnO_2基气敏材料和负载有贵金属的Al_2O_3催化涂层。通过TEM，SEM，氮吸附-脱附实验，FT-IR和原位XRD对SnO_2和Al_2O_3粉体进行了表征。在静态下测量了基于SnO_2的气体传感器的气体响应。实验结果表明，SnO_2基气体传感器对R134a的响应可通过加载贵金属和使用催化涂层显着提高。基于双层膜SnO_2（Au）/ Al_2O_3（Au）的传感器显示出令人满意的结果，包括响应速度快，选择性好，长期稳定性高，响应速度快和回收率高，揭示了其在制冷剂检测和维护中的潜在应用空调系统。最后，提出了Rl 34a的气体传感机制，并通过键能数据，FT-IR光谱和原位XRD进行了证明。

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  • 来源
    《Sensors and Actuators》 |2011年第2期|p.494-499|共6页
  • 作者

    Junchen Chen; Jiaqiang Xu;

  • 作者单位

    Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China;

    Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China, State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    sno_2; catalytic coating; gas sensor; r134a; double layer film;

    机译：sno_2;催化涂层;气体传感器;r134a;双层膜;

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