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Covalent versus Electrostatic Strategies for Nanoparticle Immobilisation

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<mark>Journal publication date</mark>2010
<mark>Journal</mark>Electroanalysis
Issue number24
Volume22
Number of pages7
Pages (from-to)2940-2946
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We demonstrate that in neutral electrolytes, a polyelectrolyte-based (ω-mercaptoacid/poly-L-lysine) immobilisation strategy for as-prepared electrostatically stabilised metal nanoparticles is a powerful alternative to often difficult to control dithiol approaches. Our data confirm straightforward preparation of high-coverage nanoparticle electrodes with fast kinetics and an electrochemical window of up to 1.5 V even in unbuffered solutions, under both stationary and hydrodynamic conditions. The stability region is limited by reductive desorption of the mercaptocarboxylic acid at negative potentials, and by nanoparticle oxidation at positive potentials. The electrostatic immobilisation is valuable for the study of electroanalytical and electrocatalytic processes using nanoparticulate electrode materials. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.