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Some More Observations on the Unique Electrochemical Properties of Electrode–Monolayer–Nanoparticle Constructs
Author(s) -
Dyne Jonathan,
Lin YuShan,
Lai Leo M. H.,
Ginges Joshua Z.,
Luais Erwann,
Peterson Joshua R.,
Goon Ian Y.,
Amal Rose,
Gooding J. Justin
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000250
Subject(s) - monolayer , nanoparticle , colloidal gold , electrode , electrochemistry , materials science , nanotechnology , chemical engineering , raman spectroscopy , adsorption , chemistry , organic chemistry , physics , optics , engineering
Physical and electrochemical properties of gold nanoparticle‐based electrodes are highlighted. Polycrystalline gold electrodes are passivated by a self‐assembled monolayer, then the immobilization of gold nanoparticles “switch on” the electrochemical reactivity of ruthenium. Herein, gap‐mode Raman studies show that the location of the nanoparticles is on the top of the monolayer, meaning that the “switching on” cannot be attributed to a direct electrical contact between nanoparticles and the gold support. This “switching on” feature is also not affected by the size of the gold nanoparticles with a range of diameters between 4 and 67 nm. Further, the charge of the nanoparticles is investigated by grafting chemical groups onto the nanoparticles which is observed to alter the electron‐transfer kinetics. The variation in rate constant however is insufficient to attribute the “switching on” phenomenon to a possible adsorption of the redox species onto the nanoparticles.