Patent ID: 8182574

Claim:
A production method for producing metal fine particles comprising the steps of: reducing metal ions in an aqueous solution containing a surfactant denoted by at least one of the following chemical formulas A, B, and C as an electrolyte by an electrochemical reduction method CH 3 (CH 2 )N + (CH 3 ) 3 Br (n is an integer from 1 to 15) A [CH 3 (CH 2 ) n ] 4 N + Br (n is an integer from 1 to 15) B [CH 3 (CH 2 ) n ] 2 N + (CH 3 ) 2 Br (n is an integer from 7 to 17) C; and adding acid into the aqueous solution to make an aspect ratio of the metal fine particles smaller than an aspect of the metal fine particles without adding acid, or adding alkali into the aqueous solution to make an aspect ratio of the metal fine particles larger than an aspect ratio of the metal fine particles without adding alkali.