Microsystem Technologies

, Volume 17, Issue 3, pp 417–423 | Cite as

Multi frequency interrogation of polypyrrole based gas sensors for organic vapors

  • Chintan M. Bhatt
  • Nagaraju JampanaEmail author
Technical Paper


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.


Odour Polypyrrole Dissipation Factor Capacitive Property Multi Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors acknowledge the support of the Centre of Excellence in Nanoelectronics (CEN) at IISc., to carry out the above investigations.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of Instrumentation and Applied PhysicsIndian Institute of ScienceBangaloreIndia

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