Journal
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
Volume 221, Issue 3, Pages 415-426Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2007.221.3.415
Keywords
gold colloid; electrochemistry; citrate reduction; electron charging; nucleation
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The mechanism of nanoparticle formation during the reduction of HAuCl4 with sodium citrate under reflux has been studied. We have found that the redox potential in the nucleating colloid remains very positive, around +0.75 V vs. Ag/AgCl, until the reaction is almost complete. It then shifts suddenly to around +0.1 V vs. Ag/AgCl at the end of the reaction, which is close to the final open-circuit potential in the sol. AuCl4- continues to be reduced slowly over the course of the reaction, but is suddenly depleted as the potential shifts near the end of the reaction. The change in potential is correlated to the peptization of aggregates to form the final monodisperse gold particles. There is also a blue-shift of the surface plasmon band associated with charging of the gold particles.
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