WIRE-SHAPED GOLD PARTICULATE, METHOD FOR PRODUCING THE SAME, COMPOSITION COMPRISING THE SAME AND APPLICATION THEREOF

PROBLEM TO BE SOLVED: To provide a method for producing wire-shaped gold particulates having excellent reproducibility in particulate sizes, to provide the wire-shaped gold particulates, to provide a composition comprising the same, and to provide application thereof. SOLUTION: Regarding the production method, in a method where gold ions are reduced in an aqueous solution, so as to produce gold particulates, the gold ions are reduced in the presence of copper ions and/or nickel ions, so as to produce wire-shaped gold particulates. Preferably, in the first reducing stage, the reduction is performed using one or more kinds of reducing agents selected from boron hydride salt, dimethylamine borane, hydrazine and ascorbic acid, and, in the following second reducing stage, the gold ions are photo-reduced by ultraviolet radiation or are chemically reduced with alkylamine or alkanolamine, thus the wire-shaped gold particulates with the major axis of 1 to 100 μm, the minor axis of 10 to 200 nm, and an aspect ratio (major axis length/minor axis length) of >10 are produced. COPYRIGHT: (C)2006,JPO&NCIPI