Control of Particle Size in the Preparation of Colloidal Gold

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Abstract
The preparation of colloidal gold is a subject of practical interest in many technological fields. It is generally accomplished by reduction of HAuCl4 solution with sodium citrate which is known to be influenced by several factors such as temperature and reactants concentration. In the course of the present investigation, the rate of addition of sodium citrate was observed to play a very important role on the particle size distribution. This aspect has not, to our knowledge, been investigated and reported previously. The studies undertaken including UV/visible absorption spectrophotometry, light scattering, and transmission electron microscopy (TEM) showed that the higher the rate of addition of sodium citrate, the smaller is the mean particle size and the narrower is the diameter of the gold particles produced.

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