NDLI: Electrochemistry of conductive polymers XVII characterization of polythiophene electrochemically polymerized in aqueous solutions

Content Provider	IEEE Xplore Digital Library
Author	Shaolin Mu Su-Moon Park
Copyright Year	1994
Description	Author affiliation: University of New Mexico (Shaolin Mu)
Abstract	Summary form only given. Polythiophene has been prepared in aqueous solutions containing 1.2 M HCI, 5.7 M ethyl alcohol, and 0.43 M thiophene by repeatedly cycling potentials between -0.25 V /spl tilde/ 1.75 V vs. the Ag/AgCl, saturated KCl reference electrode. The polymer films thus prepared were denser and more stable than those prepared in nonaqueous solutions. The films could be doped both anodically at 1.2 V an cathodically at -0.3 V; their cyclic voltammograms (CVs) were better defined and more reversible than those obtained in aqueous solvents for both oxidation and reduction. While the anodic CV currents at 1.2 V were not affected significantly by the pH of the medium, those at -0.3 V were markedly affected. The CV peak potentials were not very sensitive to pH, suggesting that proton transfer may not play a significant role during the electrochemiscal doping. The films were not destroyed even when they are anodized at +2.5 V in a LiCl solution. In-situ spectroelectrochemical experiments show that the polymer films have their maximum absorbances observed between 350 nm and 420 nm depending on the electrolytes used, indicating the band gaps, and therefore chain lengths, of the polymers could be significantly different in different electrolyte solutions. The conductivities of these polymers appear to be inferior to those prepared in nonaqueous solutions is shown by large resistances obtained from the ac impedance measurements.
Starting Page	295
Ending Page	295
File Size	99099
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.835322
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 Partial response channels Chemistry Electromagnetic wave absorption Platinum Doping Conductivity Polymer films Educational institutions Infrared spectra
Content Type	Text
Resource Type	Article

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