Comparative studies on electrical properties of Polypyrrole based gas sensor

2011 IEEE Sensors Applications Symposium Pub Date : 2011-03-28 DOI:10.1109/SAS.2011.5739793

Chintan M. Bhatt, N. Jampana

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引用次数: 8

Abstract

Polypyrrole (PPy) is one of the important conductive polymer (CP) that is widely used in gas sensing applications. It exhibits reversible changes in its direct current (DC) resistance on exposure to variety of organic vapors and gases, but the environmental stability of its resistive property is found poor. Hence polypyrrole based gas sensor is designed and its electrical properties against ethanol as an analyte has been studied. Polypyrrole is electrodeposited on interdigital gold electrode structure with potassium chloride (1M KCl) as an electrolyte using chronocoulometry. Electrical impedance spectroscopy technique is used to study electrical properties of the sensor over a frequency range 10 Hz to 2 MHz. The sensor response is monitored by measuring the changes in its impedance i.e., capacitance and resistance of the sensor upon exposure to organic vapor molecules. It is observed that the capacitive property of the sensor is more sensitive to the ethanol than its resistive property. Effect of aging on the electrical properties of the sensor is also studied and found that the capacitance has less effect with aging than its resistive property.

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聚吡咯基气体传感器电性能的比较研究

聚吡咯(PPy)是一种重要的导电聚合物，在气体传感领域有着广泛的应用。在暴露于各种有机蒸汽和气体时，其直流电阻表现出可逆性变化，但其电阻性能的环境稳定性较差。为此，设计了聚吡咯气体传感器，并对其对乙醇的电性能进行了研究。以氯化钾(1M KCl)为电解液，采用计时测温法在指间金电极结构上电沉积聚吡咯。电阻抗谱技术用于研究传感器在10 Hz至2 MHz频率范围内的电学特性。传感器的响应是通过测量其阻抗的变化来监测的，即传感器暴露于有机蒸汽分子时的电容和电阻。结果表明，该传感器的电容性比电阻性对乙醇更敏感。研究了老化对传感器电性能的影响，发现电容对老化的影响小于电阻对老化的影响。

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2011 IEEE Sensors Applications Symposium

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