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Conducting polymer-based chemical sensor: Characteristics and evaluation of polyaniline composite films
S. Unde, J. Ganu,
Published in John Wiley and Sons Ltd
Volume: 6
Issue: 3
Pages: 151 - 157
A conducting polymer-based chemical sensor was fabricated by depositing a film containing polyaniline blended with polyethylene oxide and doped with copper chloride onto interdigitated electrodes in a surface cell configuration. It was found to be very sensitive to alcoholic vapours, especially methanol. Its characteristics such as response time (tr), recovery time (td), sensitivity factor (σmax/σ0), etc. have been studied with respect to film composition, chemical vapour dosage, etc. It was found that the sensitivity was maximum and tr minimum at a certain concentration of polyaniline in the film matrix. Although the response was quite fast (tr< 10 s), the recovery was slow and in many cases followed a two-step process. The two components in the recovery were clearly delineated in log-log plots, from which one could be associated with diffusion and the other with selective residual adsorption of the chemical vapour by the conducting polymer moieties. These results have been discussed in the light of the charge transport mechanism and the formation of interfacial barriers between polyaniline domains.
About the journal
JournalData powered by TypesetAdvanced Materials for Optics and Electronics
PublisherData powered by TypesetJohn Wiley and Sons Ltd
Open AccessNo