METHOD FOR PRODUCING SILICA-COATED GOLD COLLOIDAL PARTICLE, AND SILICA-COATED GOLD COLLOIDAL PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a silica-coated gold colloidal particle which is not flocculated or discolored even when heating treatment is applied, and capable of maintaining clear red.;SOLUTION: Disclosed is a method for producing a silica-coated gold colloidal particle characterized in that a gold colloidal particle (M)-dispersed liquid in which the average particle diameter lies in the range of 5 to 100 nm, and subjected to surface treatment with a carboxyl group and/or carboxylate group-containing organic compound and a silica colloidal particle (A)-dispersed liquid in which the average particle diameter lies in the range of 4 to 40 nm, and subjected to surface treatment with an amino group-containing silane compound are mixed. Also disclosed is a method for producing a silica-coated gold colloidal particle characterized in that a gold colloidal particle (M)-dispersed liquid in which the average particle diameter lies in the range of 5 to 100 nm and a silica colloidal particle (A)-dispersed liquid in which the average particle diameter lies in the range of 4 to 40 nm, and subjected to surface treatment with a mercapto group-containing silane compound, and into which a thiol group(-SH group) is introduced are mixed.;COPYRIGHT: (C)2009,JPO&INPIT