Method of forming thin metal films on substrates

Abstract

A solution containing a metal component of composite ultrafine metal particles each having a core substantially made of metal component and a covering layer made of an organic compound chemically bonded to the core having an average diameter ranging from 1 to 10 nm, uniformly dispersed in a solvent, forms a thin metal film on the surface of a transfer sheet, after which the transfer sheet is thermally decomposed to transfer the thin metal film to a substrate.

1 . A method of forming a thin metal film, comprising: 
 preparing a solution containing a metal component, comprising at least one of composite ultrafine metal particles and an organic metal compound, and a metal powder having an average particle diameter ranging from 1 to 10 μm;    bringing said solution into contact with a surface of a substrate;    evaporating the solvent in said solution on said surface of said substrate to form an ultrafine particle coating layer on said surface of said substrate; and    thermally decomposing said ultrafine particle coating layer into a thin metal film having a thickness ranging from 10 to 1000 μm;    wherein each of said composite ultrafine metal particles has a core substantially made of a metal component and a covering layer made of an organic compound chemically bonded to said core;    said core has an average diameter ranging from 1 to 10 nm; and    said at least one of said composite ultrafine metal particles and said organic metal compound and said metal powder are uniformly dispersed in a solvent.    
   
   
       2 . A method according to  claim 1 , wherein the metal component in said solution has a total amount ranging from 30 to 90 weight %.  
   
   
       3 . A method of forming a thin metal film comprising: 
 preparing a solution containing a metal component, comprising at least one of composite ultrafine metal particles and an organic metal compound, and a metal powder having an average particle diameter ranging from 1 to 10 μm;    bringing said solution into contact with a surface of a substrate;    evaporating the solvent in said solution on said surface of said substrate to form an ultrafine particle coating layer on said surface of said substrate; and    thermally decomposing said ultrafine particle coating layer into a thin metal film having a thickness ranging from 10 to 1000 μm;    wherein each of said composite ultrafine metal particles has a core substantially made of a metal component and a covering layer made of an organic compound chemically bonded to said core;    said core has an average diameter ranging from 1 to 50 nm; and    said at least one of said composite ultrafine metal particles and said organic metal compound and said metal powder are uniformly dispersed in a solvent.    
   
   
       4 . A method according to  claim 3 , wherein the metal component in said solution has a total amount ranging from 30 to 90 weight %.