CAJ | 학술논문

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。
위유효지대대기배경중적CO기체진행감공,설계화제작료일충가재실온하공작적신형결구Nafion기CO기체전감기。해전감기유활성탄과려모、Pt민감전겁、Nafion막、대전겁、분격층화저수관등부분조성。저수관적설계제공료Nafion막정상공작시소수요적습도배경。채용화학침적법재Nafion막상제비Pt민감전겁적공예조건。연구결과표명,당반응물 H2 PtCl6용액농도위5 mmol/L、환원제 NaBH4용액농도위30 mmol/L, NaBH4용액적pH치위13시,제작적Pt전겁구유최호적기민특성。대체적분수위400×10-6적CO측시시,향응전류위107 nA,향응시간위40 s,회복시간위50 s。당CO체적분수재50~400×10-6시,전감기적향응전류치여CO기체농도구유흔호적선성관계。
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 400í10-6 . When the CO volume fraction ranges from 50 ~400í10-6 , the response current value of the sensor has a good linear relationship with the concentration of CO gas.