Gold Nanoparticle Formation during Bromoaurate Reduction by Amino Acids

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Abstract
The synthesis and characterization of water-soluble dispersions of gold nanoparticles by the reduction of a potassium tetrabromoaurate precursor solution using the amino acids l-tyrosine, glycyl-l-tyrosine, and l-arginine using alkaline synthesis conditions are reported. The particle sizes determined by small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (HRTEM) measurements are found to be inversely proportional to the rate of particle formation, which was determined by time-resolved UV−visible spectrophotometry measurements, and vary very slowly at intermediate gold concentrations and rapidly at the extremes. Dispersions produced with a mixture of the two amino acids glycyl-l-tyrosine and l-tyrosine showed particle sizes and particle size distributions which were directly proportional to the ratio of the two l-amino acids, thus offering the possibility for control over the properties of the gold nanoparticle dispersions.

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