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Multi-frequency interrogation technique applied to conducting polymer gas and odour sensors

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2 Author(s)
Amrani, M.E.H. ; Dept. of Instrum. & Anal. Sci., Univ. of Manchester Inst. of Sci. & Technol., UK ; Payne, P.A.

Certain electrically conducting polymers, such as polypyrrole, exhibit reversible changes in their direct current (DC) resistance on exposure to a variety of odours and gases. This phenomenon has immense practical use in a variety of industrial and research environments. Commercially available instruments exploiting this effect employ arrays of conducting polymer sensors. Each element of which has broad, but overlapping, specificity to a range of volatiles. The authors show that similar descriptors can be generated by using alternating current (AC) measurements over a wide range of frequencies to follow the changes in electrical characteristics of a single sensor. This approach is shown to give rise to impressive improvements in sensor sensitivity and discrimination

Published in:

Science, Measurement and Technology, IEE Proceedings -  (Volume:146 ,  Issue: 2 )

Date of Publication:

Mar 1999

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