Investigation of interparticle interactions of larger (4.63 nm) monolayer protected gold clusters during quantized double layer charging

Physical Chemistry Chemical Physics : PCCP
Nirmalya Kumar ChakiC V Dharmadhikari

Abstract

In this article, the effect of interparticle interactions of 4.63 nm sized monolayer protected gold clusters (Au MPCs) during quantized double layer (QDL) charging has been investigated using electrochemical techniques. Voltammetry and scanning tunneling microscopy have been used to compare their electron transfer behavior. Furthermore, since the QDL process is diffusion controlled, the diffusion coefficient values have been estimated at various charge steps using two independent electroanalytical techniques, viz. chronoamperometry and impedance. These results show that higher core charge facilitates higher diffusion coefficient values, and indicate that repulsive interactions dominate for charged MPCs compared to those of its neutral analogue, which are mainly attractive in nature. Additionally, the electron transfer rate constants at various charge steps have been estimated from the impedance results, showing comparatively faster electron transfer rate at higher charge states.

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Citations

Oct 23, 2009·Nanotechnology·Javier CerveraSalvador Mafé
Oct 1, 2011·Nanotechnology·Javier CerveraSalvador Mafé
Feb 26, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Javier Cervera, Salvador Mafé
Jul 23, 2013·Journal of the American Chemical Society·Tessa M Carducci, Royce W Murray

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