Covalent versus Electrostatic Strategies for Nanoparticle Immobilisation

Autor:	Thomas Wandlowski, Luca Siffert, Stijn F. L. Mertens, Angela Bütikofer
Rok vydání:	2010
Předmět:	Materials science Inorganic chemistry Nanoparticle Dithiol Self-assembled monolayer Polyelectrolyte Analytical Chemistry chemistry.chemical_compound chemistry Colloidal gold Electrode Electrochemistry Cyclic voltammetry Electrochemical window
Zdroj:	Electroanalysis. 22:2940-2946
ISSN:	1040-0397
Popis:	We demonstrate that in neutral electrolytes, a polyelectrolyte-based (w-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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f5aa159fdb2f4625179b440dffb69135 https://doi.org/10.1002/elan.201000311 Zobrazit plný text záznamu Plný text