Preparation of Aqueous Gold Colloid by Vapor Deposition Method
Gold vapor and water vapor were co-condensed on a cooled surface and then the ice was melted to obtain highly pure aqueous gold colloid. After removing gold aggregate, we obtained a supernatant solution of gold which is transparent and purple in color. A surface plasmon resonance absorption peak appeared at about 550 nm. The gold colloid was stable for more than a year without any additives.
Kobayashi
Y
Institute for Chemical Reaction Science, Tohoku University, Katahira, Aoba-ku, Sendai, 980-77, Japan
Tomita
A