Silver fine particle production method and silver fine particles

Abstract

A production method for silver fine particles retain capabilities such as conductivity and make it possible to form wiring at even lower temperatures; and silver fine particles. A silver fine particle production method in which silver powder is used to produce silver fine particles by means of a gas phase method. The silver fine particle production method has a step for supplying an organic acid to the silver fine particles. The gas phase method is, for example, a plasma method or a flame method. The silver fine particles have a surface coating that includes at least a carboxyl group.

1 . Silver fine particles each having a surface coating,
 wherein the surface coating contains at least a carboxyl group.   
     
     
         2 . The silver fine particles according to  claim 1 ,
 wherein the silver fine particles have a particle size of 1 to 100 nm.   
     
     
         3 . Silver fine particles each having a surface coating,
 wherein the surface coating is constituted of an organic substance generated by thermal decomposition of an organic acid.   
     
     
         4 . The silver fine particles according to  claim 3 ,
 wherein the silver fine particles have a particle size of 1 to 100 nm.   
     
     
         5 . The silver fine particles according to  claim 3 ,
 wherein the organic acid is at least one of L-ascorbic acid, formic acid, glutaric acid, succinic acid, oxalic acid, DL-tartaric acid, lactose monohydrate, maltose monohydrate, maleic acid, D-mannite, citric acid, malic acid and malonic acid.   
     
     
         6 . The silver fine particles according to  claim 3 ,
 wherein the organic acid is citric acid or malic acid.   
     
     
         7 . The silver fine particles according to  claim 4 ,
 wherein the organic acid is at least one of L-ascorbic acid, formic acid, glutaric acid, succinic acid, oxalic acid, DL-tartaric acid, lactose monohydrate, maltose monohydrate, maleic acid, D-mannite, citric acid, malic acid and malonic acid.   
     
     
         8 . The silver fine particles according to  claim 4 ,
 wherein the organic acid is citric acid or malic acid.