Multi-frequency Measurements Of Organic Conducting Polymers For Sensing Of Gases And Vapours
Multi-frequency Measurements Of Organic Conducting Polymers For Sensing Of Gases And Vapours
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DOI：
10.1109/sensor.1995.717356
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发表时间：
1995-06
期刊：
影响因子：
--
通讯作者：
M. Amrani;P. A. Payne;K. Persaud
中科院分区：
文献类型：
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作者：
M. Amrani;P. A. Payne;K. Persaud
导电有机聚合物的电导率取决于掺入到材料中的掺杂离子的浓度。这种电导率通常用直流电（dc）技术测量，可以在环境温度下通过挥发性化学物质的吸附和解吸可逆地快速调节。这一现象在气体和气味感知方面有着巨大的实际用途。通过使用对一系列挥发物具有广泛重叠特异性的导电聚合物传感器阵列，我们能够测量挥发物并为其分配描述符。在本文中，我们证明了类似的描述符可以通过使用适当频率的交流电（ac）来跟踪传感器电容，电导和耗散因子的变化。我们还表明，使用单个传感器，我们可以获得化学物种之间的区分。这些传感器的交流响应特性已经使用一个简单的电路等效模型，我们表明，该模型是一个很好的预测传感器性能。
Electrically conducting organic polymers display electrical conductivities that are dependent on the concentration of dopant ions incorporated in the material. This conductivity, usually measured using direct current (dc) techniques, may be modulated reversibly and rapidly at ambient temperature by adsorption and desorption of volatile chemicals. This phenomenon has immense practical use for gas and odour sensing. By using arrays of conducting polymer sensors having broadly overlapping specificity to a range of volatiles, we are able to measure and assign descriptors to the volatiles. In this paper we show that similar descriptors can be generated by using alternating current (ac) at suitable frequencies to follow the changes in sensor capacitance, conductance and dissipation factor. We also show that using a single sensor we can obtain discrimination between chemical species. The ac response characteristics of these sensors has been modelled using a simple electrical circuit equivalent and we show that the model is a good predictor of sensor performance.