Assembly of electroactive ordered multilayer films of cobalt phthalocyanine tetrasulfonate and polycations
Date
1999Author
Lvov, Yuri M
Kamau, Geoffrey N
Zhou, De-Ling
Rusling, James F
Type
ArticleLanguage
enMetadata
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Films with alternating layers of the anion cobalt phthalocyanine tetrasulfonate (CoIIPcTS4−) and cationic polydimethyldiallylammonium chloride (PDDA) were prepared by electrostatic layer-by-layer adsorption. Quartz crystal microbalance and optical studies demonstrated formation of smooth ultrathin films with a linear increase in thickness with the number of deposition steps. Films containing 1, 2, 3, 4, and 5 bilayers of CoIIPcTS4−/PDDA on a gold electrode gave reversible, reproducible steady state cyclic voltammetry for the CoII/CoIredox couple with midpoint potential at −0.28 V vs a saturated calomel reference electrode. Voltammetry was controlled predominantly by charge transport processes in the film, even for films containing only a bilayer of PDDA/CoIIPcTS4−. The peak reduction current increased with the number of layers and showed a tendency to saturation after a deposition of 4–5 bilayers.
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http://www.sciencedirect.com/science/article/pii/S0021979798960830http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/35737
http://www.ncbi.nlm.nih.gov/pubmed/10092389