Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 6, Issue 1, Pages 49-54Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2003.10.004
Keywords
cytochrome c; gold nanoparticles; sol-gel; direct electron transfer
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Quasi-reversible and direct electrochemistry of cytochrome c (cyt. c) has been obtained at a novel electrochemical interface constructed by self-assembling gold nanoparticles (GNPs) onto a three-dimensional silica gel network, without polishing or any modification of the surface. A cleaned gold electrode was first immersed in a hydrolyzed sol of the precursor (3-mercaptopropyl)-trimethoxysilane to assemble three-dimensional silica gel, then the GNPs were chemisorbed onto the thiol groups of the sol-gel network and modified the kinetic barrier of this self-assembled silicate film. Cyclic voltammetry and AC impendance spectroscopy were performed to evaluate electrochemical properties of the as prepared interface. These nanoparticle inhibits the adsorption of cyt. c onto bare electrode and acts as a bridge of electron transfer between protein and electrode. (C) 2003 Elsevier B.V. All rights reserved.
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