ISSN:
1040-0397
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The effect of increasing the cross-linking of poly(4-vinylpyridine) films on glassy carbon substrates for the electrochemical deposition of Ag microparticles has been investigated. Cyclic voltammetric patterns for the deposition and stripping processes are elucidated. The electrochemical potential required for the deposition shifts to more negative values with cross-linking. These shifts can be attributed to the polymer becoming more compact and to increased electrical resistance. There are two different components to this resistance. One is related linearly to the thickness of the film, while the other is independent of thickness. Both components are, however, related to the degree of cross-linking. For the first component, the effect may be due to an increase in the resistance for electrolyte transport through the polymer channels constricted by the cross-linking. The other is attributed to the increased resistance for water and electrolyte penetration from the solution phase into the polymer, whose hydrophobicity is increased by the cross-linking and, thereby, is unwetted and insulative. Useful information regarding the permeability of the cross-linked polymer is obtained by using silver as a probe.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140020804
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