Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 488, Issue 2, Pages 125-132Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(00)00201-1
Keywords
glassy carbon; metal deposition; modified electrodes; gold nanoparticles
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In this work we combine electrochemical metal deposition with the self-assembly of thiolate monolayers in an effort to develop a novel method for attaching predefined functional groups to glassy carbon (GC) electrodes. Gold nanocrystals were electrochemically deposited on polished GC substrates by a potential step and subsequently modified by exposure to ethanolic solutions of n-alkanethiols. The structure of the resultant monolayers was then studied using electrochemical blocking analysis and infrared reflection absorption spectroscopy. Our analyses indicate that monolayers adsorbed to gold nanocrystals on GC adopt a more disordered structure relative to similar monolayers adsorbed to planar Au substrates. This is likely due to a high density of step sites on electrochemically deposited Au particles. Finally, we demonstrate our ability to employ a sequence of deposition and modification steps to introduce multiple functional groups on a single GC electrode. (C) 2000 Published by Elsevier Science S.A.
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