Chemistry Letters, Vol.33, No.7, 788-789, 2004
Construction of organic monolayers with electron transfer function on a hydrogen terminated Si(III) surface via silicon-carbon bond and their electrochemical characteristics in dark and under illumination
An organic monolayer with a functional group of electron mediation capability, viologen, was constructed on a hydrogen-terminated Si(111) surface via Si-C bond by photochemical attachment of 4-vinylbenzyl chloride followed by a surface quarternization reaction with 1-methyl-4-(4-pyridyl)pyridinium iodide. Furthermore, Pt particles were deposited on the monolayer by ion exchange reaction with PtCl42-followed by reduction by hydrogen gas. The mediation of electron transfer by viologen moieties was proved and electrochemical hydrogen evolution reaction rates were enhanced after the Pt deposition.