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 goldnanoparticles from Au(III) and the reducing agent sulfite. A core–shell Mie model was usedto describe the optical properties of gold nanoparticles in the reverse micelles. Dynamiclight scattering of gold colloids in aqueous media and in reverse micelle solution indicatedagglomeration of micelles containing particles. This was verified theoreticallywith an analysis of the total interaction energy between pairs of particles as afunction of particle size. The analysis indicated that particles larger than about8 nm in diameter should reversibly flocculate. Transmission electron microscopymeasurements of gold nanoparticles produced in our reverse micelles showed diametersof 8–10 nm. Evidence of cluster formation was also observed. Time-correlatedUV–vis absorption measurements showed a red shift for the peak wavelength.This was interpreted as the result of multiple scattering and plasmon interactionbetween particles due to agglomeration of micelles with particles larger than8 nm.
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