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The controlled electrochemical deposition of a series of four diazonium salts (4-bromobenzene, 4-iodobenzene, 4-methoxybenzene and 4-diethylaminobenzene diazonium) on carbon surfaces has been achieved by exploiting the use of three redox mediators: 2,2-diphenyl-1-picrylhydrazyl, chloranil and dichlone. The efficiency of the method rests on a fast redox cross reaction in the diffusion layer between the diazonium compound and the reduced form of the selected inhibitor, characterized by an outer-sphere electron transfer. The effect of the inhibitor addition in the deposition solution was characterized using electrochemical techniques, X-ray photoelectron spectroscopy and atomic force microscopy. Near-monolayer are obtained when the potential of the redox mediator is at least 100 mV lower than the reduction potential of the diazonium salt concerned. A judicious choice of the redox entity would allow, via a fine control of the experimental conditions, to modulate the thickness of organic layers by varying the grafting potential.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
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