基于Pt电极和Nafion电解质的CO传感器研究  

CO Gas Sensor Based on Nafion and Pt Sensing Electrode

作　　者：刘英伟[1,2] 金哲范 白璐[1,2] 梁喜双[1,2] 卢革宇[1,2] 

机构地区：[1]吉林大学集成光电子学国家重点联合实验室吉林大学实验区,长春130012 [2]吉林大学电子科学与工程学院,长春130012

出　　处：《吉林大学学报（信息科学版）》2014年第3期267-274,共8页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金资助项目(61374218);吉林省科技发展计划项目青年科研基金资助项目(20107522159JH)

摘　　要：为有效地对大气环境中的CO气体进行监控,设计和制作了一种可在室温下工作的新型结构Nafion基CO气体传感器。该传感器由活性炭过滤帽、Pt敏感电极、Nafion膜、对电极、分隔层和储水罐等部分组成。储水罐的设计提供了Nafion膜正常工作时所需要的湿度环境。采用化学沉积法在Nafion膜上制备Pt敏感电极的工艺条件。研究结果表明,当反应物 H2 PtCl6溶液浓度为5 mmol/L、还原剂 NaBH4溶液浓度为30 mmol/L, NaBH4溶液的pH值为13时,制作的Pt电极具有最好的气敏特性。对体积分数为400×10^-6的CO测试时,响应电流为107 nA,响应时间为40 s,恢复时间为50 s。当CO体积分数在50-400×10^-6时,传感器的响应电流值与CO气体浓度具有很好的线性关系。In order to monitor the CO gas in the environment effectively, a new CO sensor which could work at room temperature was designed and fabricated. The sensor is composed of active carbon filtrated cap, Pt sensing electrode, Nafion membrane, counter electrode, the isolation and reservoir. The design of the reservoir provides the humidity environment that Nafion membrane needed for the normal work. The sensing properties of the sensor are mainly determined by the Pt sensing electrode. The preparing conditions of chemical deposition were mainly investigated. When the concentration of H2 PtCl6 and NaBH4 are 5 mmol/L and 30 mmol/L, respectively, and the pH value of NaBH4 solution is 13, the sensor gave the best sensing performance. The response current is 107 nA, and the response and recovery time are 40 s and 50 s, respectively, when the concentration of CO is 400×10^-6 . When the CO volume fraction ranges from 50 -400×10^-6 , the response current value of the sensor has a good linear relationship with the concentration of CO gas.

关 键 词：气体传感器 Pt敏感电极 一氧化碳 NAFION膜 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]