Some more observations on the unique electrochemical properties of electrode-monolayer-nanoparticle constructs.
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.
Dyne
Jonathan
J
School of Chemistry, The University of New South Wales, Sydney NSW 2052, Australia.
Lin
Yu-Shan
YS
Lai
Leo M H
LM
Ginges
Joshua Z
JZ
Luais
Erwann
E
Peterson
Joshua R
JR
Goon
Ian Y
IY
Amal
Rose
R
Gooding
J Justin
JJ
D000327:Adsorption; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
D006046:Gold