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Synthesis and agglomeration of gold nanoparticles in reverse micelles
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Abstract
Reverse micelles prepared in the system water, sodium bis-(2-ethylhexyl)
sulfoccinate (AOT), and isooctane were investigated as a templating system for the
production of gold nanoparticles from the reduction of Au (III) by sulfite ions. A coreshell
Mie model was used to describe the optical properties of gold nanoparticles
synthesized inside the reverse micelles. Dynamic light scattering measurements of gold
colloids in aqueous media and in reverse micelle solution indicated agglomeration of
micelles containing particles. This agglomeration was verified theoretically by estimating
the total interaction energy between pairs of particles as a function of particle size. The
analysis indicated that particles larger than about 8 nm diameter should reversibly
flocculate. Transmission Electron Microscopy measurements of gold nanoparticles
produced inside reverse micelles showed diameters of 8 to 10 nm. Evidence of cluster
formation was also observed. Time correlated UV-Vis absorption measurements showed
a red shift for the peak wavelength. This was interpreted as the result of multiple
scattering and plasmon interaction between particles due to agglomeration of micelles
with particles larger than 8 nm.
Description
Date
2005
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Keywords
Nanoparticles, Reverse micelles