NDLI: Tbe determination of tbe anion content in polyaniline as a function of the PH and tee electrode potential: an in situ ATR FTIR spectroscopic study

Content Provider	IEEE Xplore Digital Library
Author	Zhao Ping Neugebauer, H. Neckel, A.
Copyright Year	1994
Description	Author affiliation: University of Vienna (Zhao Ping)
Abstract	Summary form only given. Polyaniline is outstanding amongst the conducting polymers for its exhibiting potential induced as well as pH induced insulator to metal transitions. As an adherent film on the surface of an electrode, it can exist in different forms depending on the pH value of the electrolyte (salt forms and base forms) and on the potential of the electrode (leucoemeraldine form, emeraldine form, pernigraniline form). The mechanisms of the salt-base transitions and the transitions between the different oxidation states are still subject of discussion. Especially the determination of the amount of anions incorporated in the polymer film at a distinct pH value and a distinct electrode potential is of basic interest for the determination of the reaction mechanisms. Due to changes of the chemical environment using ex situ techniques, these values can be measured only with subtle in situ techniques. In this paper, we describe the determination of the anion content of polyaniline films on the Surface of IR transparent electrodes using in situ ATR FTIR spectroscopy. Since the pH value of the elec trolyte and the potential of the electrode can be varied during the spectroscopic characterization of the anion content, we can derive three dimensional plots of the amount of incorporated anions vs. the pH and the oxidation degree of the polymer. Using these results, the meachnisms of the various transitions of polyaniline can be described with better accuracy.
Starting Page	40
Ending Page	40
File Size	85231
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.834695
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 Spectroscopy Chemistry Polymer films Metal-insulator structures Optical films Optical reflection Plastic insulation Chemicals Optical polymers
Content Type	Text
Resource Type	Article

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