Patent ID: 9580811
Date: 2017-02-28
CPC Classifications: B22F,B82Y,C23C,H01B,H01L,Y02E

Claim:
1. A method for synthesizing metal nanoparticles, comprising the steps of: preparing an aqueous metal salt solution (A) by dissolving a metal salt, said aqueous metal salt solution (A) consisting essentially of the metal salt and a solvent; preparing an aqueous carboxylic acid solution (B) by dissolving one type or two or more types of compounds selected from the group consisting of, citric acid, maleic acid, and salts thereof; preparing an aqueous reducing agent solution (C) by dissolving one type or two or more types of compounds selected from the group consisting of formic acid and salts thereof; mixing the aqueous carboxylic acid solution (B) with the aqueous metal salt solution (A) so as to obtain a suspension of a carboxylic acid salt in which poorly-soluble carboxylic acid salt precipitates; and forming metal nanoparticles by adding and mixing the aqueous reducing agent solution (C) with the suspension of the carboxylic acid salt, wherein the aqueous solutions (A), (B), and (C) are separately prepared, metal elements contained in the metal salt comprise 75% by mass or more of silver, and the mixing with the aqueous reducing agent solution is carried out by stirring at a temperature of 25 to 95° C.