NDLI: Factors affecting the electropolymerization of aniline from aqueous solutions

Content Provider	IEEE Xplore Digital Library
Author	Rajapakse, R.M.G. Lankeshwara, L.P.P. Careem, M.A.
Copyright Year	1994
Description	Author affiliation: University of Peradeniya (Rajapakse, R.M.G.)
Abstract	Summary form only given. Electropolymerization of aniline and the synthesis of conducting polyaniline films on Pt-disc electrodes from a deoxygenated solution of 0.1 mol dm/sup -3/ aqueous background electrolytes containing aniline will be described. Results show that the rate of polymerization and the conductivity of polymer depend on various factors such as nature of the background electrolyte, pH of the medium, applied potential, etc. Cyclic voltammograms show that polyaniline is non conducting if grown from a medium of pH above 3, below ca. 0.6 V (wrt SCE). The peak positions and currents of cyclic voltammograms are greatly influenced by the anion of the background electrolyte. Also the cyclic voltammograms recorded at various scan rates are used to analyze the polymerization mechanism. Although the peak current is found to be proportional to the square root of the scanning rate, the other conditions for reversible electron transfer are not satisfied. Data fit closely with the ECE mechanism. Also polyaniline shows a spectrum of colours with the change of potential. For instance, it is dark blue at about +0.7 V which changes to Greenish blue at + 0.20 V, Green at +0.10 V, light green at - 0.40 V and yellow at - 0.60 V all with respect to SCE. N-methyl substitutions enhances the intensities of the colours.
Starting Page	256
Ending Page	256
File Size	89720
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835245
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrodes Chemistry Conductivity Electrochromism Optical materials Nuclear magnetic resonance Polymers Conductive films Optical devices Electrons
Content Type	Text
Resource Type	Article

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