Conductive material, conductive film, and production method thereof

Abstract

There are provided a conductive material obtained by bringing a π conjugated polymer into contact with an ionic liquid and a conductive film obtained by bringing a π conjugated polymer film into contact with the ionic liquid. Method of producing them is provided.

1 . A conductive material prepared by a process comprising:
 obtaining a π conjugated polymer,   obtaining an ionic liquid,   contacting the π conjugated polymer with the ionic liquid, and   washing the conductive material with an organic solvent,   wherein the conductivity of the conductive material is 10 times or more of the conductivity of the π conjugated polymer before being brought into contact with the ionic liquid.   
     
     
         2 . The conductive material according to  claim 1 , wherein:
 the π conjugated polymer is formed from a salt of poly (3,4-ethylenedioxy thiophene) and poly (styrenesulfonic acid); and   the ionic liquid is selected from 1-hexyl-3-methylimidazolium iodide, 1-ethyl-3-methylimidazolium bis(trifluoromethane sulfonic acid) imide, and a 10:1 mixture of the 1-hexyl-3-methylimidazolium iodide and iodine.   
     
     
         3 . The conductive material according to  claim 1  further prepared by:
 drying the conductive material.   
     
     
         4 . A conductive film prepared by a process comprising:
 obtaining a π conjugated polymer film,   obtaining an ionic liquid,   contacting the π conjugated polymer film with the ionic liquid; and   washing the π conjugated polymer film with an organic solvent,   wherein the sheet resistance of the conductive film is 0.1 times or less of the sheet resistance of the π conjugated polymer film before being brought into contact with the ionic liquid.   
     
     
         5 . The conductive film according to  claim 4  wherein:
 the π conjugated polymer film is formed from a salt of poly (3,4-ethylenedioxy thiophene) and poly (styrenesulfonic acid); and   the ionic liquid is selected from 1-hexyl-3-methylimidazolium iodide, 1-ethyl-3-methylimidazolium bis(trifluoromethane sulfonic acid) imide, and a 10:1 mixture of the 1-hexyl-3-methylimidazolium iodide and iodine.   
     
     
         6 . The conductive film according to  claim 4  further prepared by:
 drying the conductive film.   
     
     
         7 . The conductive material according to  claim 1 , wherein the ionic liquid has redox potential levels which do not cause oxidation or reduction of the π conjugated polymer. 
     
     
         8 . The conductive material according to  claim 1 , wherein the volume of the π conjugated polymer after being contacted with the ionic liquid is smaller than the volume of the π conjugated polymer before being brought into contact with the ionic liquid. 
     
     
         9 . The conductive film according to  claim 4 , wherein the ionic liquid has redox potential levels which do not cause oxidation or reduction of the π conjugated polymer film. 
     
     
         10 . The conductive film according to  claim 4 , wherein the film thickness of the π conjugated polymer film after being contacted with the ionic liquid is smaller than the film thickness of the π conjugated polymer film before being brought into contact with the ionic liquid.