Film forming device and method for forming metal film using the same

Abstract

A film forming device for forming a metal film at a high current efficiency and a method for forming the metal film using the film forming device are provided. The film forming device to form the metal film includes an anode, a cathode, a porous membrane disposed between the anode and the cathode to be capable of contacting the cathode, a solution container defining a solution containing space between the anode and the porous membrane, and a power supply applying a voltage between the anode and the cathode. The porous membrane is composed of a polyolefin chain without an ion-exchange functional group.

What is claimed is: 
     
         1 . A film forming device for forming a metal film comprising:
 an anode;   a cathode;   a porous membrane disposed between the anode and the cathode to be capable of contacting the cathode;   a solution container defining a solution containing space between the anode and the porous membrane; and   a power supply applying a voltage between the anode and the cathode,   wherein the porous membrane is composed of a polyolefin chain without an ion-exchange functional group.   
     
     
         2 . The film forming device according to  claim 1 ,
 wherein the porous membrane has a pore diameter within a range of 20 to 2000 nm.   
     
     
         3 . The film forming device according to  claim 1 ,
 wherein the porous membrane has air permeability within a range of 5 to 500 s/100 cm 3 .   
     
     
         4 . A method for forming a film of metal comprising
 applying a voltage between the anode and the cathode in the film forming device according to  claim 1  in a state where the solution containing space is filled with a liquid electrolyte containing ions of the metal and the porous membrane is in contact with the cathode.   
     
     
         5 . The method according to  claim 4 ,
 wherein the metal has a negative standard oxidation-reduction potential.   
     
     
         6 . The method according to  claim 4 , further comprising
 impregnating the porous membrane with ethanol,   wherein the voltage is applied between the anode and the cathode while the porous membrane is heated.   
     
     
         7 . The method according to  claim 4 ,
 wherein the metal is tin or nickel.   
     
     
         8 . The method according to  claim 7 ,
 wherein the metal is the tin, and the liquid electrolyte contains methanesulfonic acid.