Abstract
The electrochemical response of electrodeposited polyaniline is shown to depend strongly upon the pH of the deposition solution. The concentration of anion present during deposition has only a weak effect. When the pH of the deposition solution is less than 1.0, the response is typical of the para-substituted phenyleneamineimine structure. When the pH of the deposition solution is greater than 1.0, an additional voltammetric wave appears, and the response is a function of the dopant anion. Infrared spectroscopy was used to examine the structural properties of these films directly in situ. While films that displayed voltammetry typical of the para-substituted compound decomposed to form p-benzoquinone at high positive potentials, films displaying atypical voltammetry did not show evidence of p-benzoquinone decomposition products. Spectral analysis indicates that cross-linked structures may be important in determining the anion-dependent voltammetric response. Further, investigations into the nature of bonding in the polymer-dopant complex revealed a weak ionic interaction.
Original language | English |
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Pages (from-to) | 1527-1534 |
Number of pages | 8 |
Journal | Langmuir |
Volume | 6 |
Issue number | 10 |
DOIs | |
State | Published - 1990 |