2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

A Mechanism and Knetic Growth Study for Gold Nanoparticles

X. Liu, J.P. Brennan and Q. Huo
Univeristy of Central Florida, US

Keywords:
kinetic, nanoparticles, oleylamine

Abstract:
Nanoparticle growth in solution is a rather complicated process governed by many thermodynamic and kinetics factors, while the growth kinetics and mechanism are not well understood. We herein report a mechanism and kinetic study of two nanoparticles: butane thiol (A) and oleylamine (B) protected gold nanoparticles. Our study revealed that the reproducibility of Brust-Schiffrin reaction for BtAuNPs synthesis is rather poor due to the intrinsic complexity of this two-phase reaction. TEM images showed that nanoparticles grew rapidly at early stage of reaction and reached a maximum then decreased to stable value. For OAAuNPs, FT-IR and 1H NMR exposed a conversion of oleylamine ligands to oleylamides after gold (III) was reduced to gold (I) and gold atoms. It’s found large Au-amine complex was formed fast and decomposed to tiny nanoparticles, then recombined to nanoparticles again. The oleylamide ligands formed a H-bonding network as a protecting monolayer around the nanoparticles. For both growth procedures, kinetic modeling was performed, by assuming that the nanoparticle core expands through incremental addition of gold atoms.

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