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초록

Shape and size controlled synthesis of gold particles has been studied by using wet-chemical method. When AuCl4- in aqueous HAuCl4 precursor was reduced using Na2SO3 as a reducing agent, mixtures of spherical, triangular and hexagonal particles were prepared in a few minutes. It was found that the shape selective oxidative etching by AuCl4- + C l-anions and crystal growth took place simultaneously. As the AuCl4- and Cl- concentration increased, yields of large triangular and hexagonal plate type particles increased, while the spherical particles decreased in most cases. Possible etching and growth mechanisms are discussed.

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