Multi frequency interrogation of polypyrrole based gas sensors for organic vapors

Bhatt, Chintan M and Jampana, Nagaraju (2011) Multi frequency interrogation of polypyrrole based gas sensors for organic vapors. In: Microsystem Technologies, 17 (3). pp. 417-423.

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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.

Item Type:	Journal Article
Publication:	Microsystem Technologies
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	06 May 2011 05:21
Last Modified:	13 Oct 2011 07:11
URI:	http://eprints.iisc.ac.in/id/eprint/37376

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