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Silver deposition at poly(4‐vinylpyridine) films on glassy carbon: Effects of polymer cross‐linking
Author(s) -
Saiki Hiroshi,
Shimazu Katsuaki,
Kuwana Theodore
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020804
Subject(s) - polymer , materials science , glassy carbon , electrolyte , deposition (geology) , electrochemistry , penetration (warfare) , chemical engineering , cyclic voltammetry , electrode , composite material , chemistry , paleontology , operations research , sediment , engineering , biology
Abstract 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.