PREPARATION OF GOLD COLLOIDS WITH UV IRRADIATION USING DENDRIMERS AS STABILIZER

Au colloids have been prepared by reduction of metal salt with UV irra diation in the presence of dendrimers. Poly(amidoamine) dendrimers wit h surface amino groups for generations 0, 1, 2, 3, 4, and 5 (G0-5) hav e been used. The average particle sizes decrease with an increase of c oncentration of surface amino group of the dendrimers. In particular, Au colloids with a diameter less than I nm are obtained in the presenc e of the later generation dendrimers(G3-5) at above the molar ratio of surface amino group of dendrimer/HAuCl4(4:1). These concentrations ar e extremely small compared with that of other polymers, indicating tha t the dendrimers have an effective protective action for the formation of Au colloids.