Chemical and Electrochemical Polymerization of 3-Alkylthiophenes on Self-assembled Monolayers of Oligothiophene-Substituted Alkylsilanes

Autor:	Seiji Inaoka, David M. Collard
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Silanes Self-assembled monolayer Surfaces and Interfaces Polymer Condensed Matter Physics Silane chemistry.chemical_compound Monomer Polymerization chemistry Monolayer Polymer chemistry Electrochemistry General Materials Science Self-assembly Spectroscopy
Zdroj:	Langmuir. 15:3752-3758
ISSN:	1520-5827 0743-7463
Popis:	Monolayers of oligothiophene-substituted alkylsilanes, chlorodimethyl(11-(3-(2,2‘bithienyl))undecyl)silane and chlorodimethyl(11-(3‘-(2,2‘:5‘,2‘ ‘-terthienyl))undecyl)silane, are subject to electrochemical oxidation within the monolayer to afford more highly conjugated oligomers with lower redox potentials. The electrochemical polymerization of 3-methylthiophene is promoted by monolayers of the oligothiophene-substituted silanes on the electrode surface to form smooth, highly adherent films of poly(3-methylthiophene). The effect of monolayers of an electroactive monomer on the rate of deposition of poly(3-methylthiophene) is compared to the effect of low concentrations of oligomers in solution. Chemical polymerization of 3-octylthiophene on substrates modified with the redox-active silanes gives films of poly(3-octylthiophene) which display reversible solvatochromism without dissolving the polymer. These thin films are sensitive to low concentrations of chloroform in the vapor phase or in aqueous solution.
Databáze:	OpenAIRE
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