Multi frequency interrogation of polypyrrole based gas sensors for organic vapors |
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Authors: | Chintan M Bhatt Nagaraju Jampana |
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Affiliation: | (1) Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, 560012, India; |
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Abstract: | Polypyrrole exhibits reversible changes in their direct current resistance on exposure to organic volatiles. However, one
needs to employ an array of such sensors to discriminate organic volatiles present in a mixture. Hence, polypyrrole based
gas sensor is designed for the detection and discrimination of different organic volatiles. Multi frequency impedance measurement
technique is used to detect the organic vapors, such as acetone, ethanol and Isopropyl alcohol, in the gas phase, over a frequency
range 10 Hz to 2 MHz. The sensor response is monitored by measuring the changes in its capacitance, resistance and the dissipation
factor upon exposure to organic volatiles. It is observed that the capacitive property of the sensor is more sensitive to
these volatiles than its resistive property. Each volatile responds to the sensor in terms of dissipation factor at specific
frequency and found that the peak magnitude has a linear relationship with their concentrations. |
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Keywords: | |
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