Conductive graphene-metal composite material, the production method of the same and use of the same

Abstract

The invention provides a conductive graphene-metal composite material, which is a composite of monolayer graphene nanoflakes and metal or metal oxide. The monolayer graphene nanoflakes of the invention are made by exfoliating graphite, and have a good combination with metal material by adopting an ultrasonic treatment or a mechanical agitation treatment. The graphene is uniformly dispersed therein and forms a conductive network, which can improve the electrochemical activity efficiently and reduce the resistance against the transfer of the charges efficiently. Use of the graphene-metal composite electrode reduces the costs of processes and facilities, on the premise of good properties. It can be used to replace the ITO conductive layer of the liquid crystal display.

What is claimed is: 
     
         1 . A conductive material, which is a composite of
 monolayer graphene nanoflakes; and   metal or metal oxide.   
     
     
         2 . The conductive material according to  claim 1 , wherein the metal and the metal oxide are aluminium and aluminium oxide, respectively. 
     
     
         3 . The conductive material according to  claim 1 , wherein the weight ratio between the monolayer graphene nanoflakes and the metal or the metal oxide is 1:50-1:600. 
     
     
         4 . The conductive material according to  claim 3 , wherein the weight ratio between the monolayer graphene nanoflakes and the metal or the metal oxide is 1:100-1:400. 
     
     
         5 . The conductive material according to  claim 1 , wherein the monolayer graphene nanoflakes are prepared from graphite oxide by a rapid thermal exfoliation method or a solvothermal method. 
     
     
         6 . The conductive material according to  claim 1 , wherein the conductive material is prepared by subjecting monolayer graphene nanoflakes and a metal or metal oxide to a phase coating and mixing by an ultrasonic treatment or a mechanical agitation treatment. 
     
     
         7 . A method of producing a conductive material, the method comprising:
 1) processing graphite oxide into a graphene suspension comprising monolayer graphene nanoflakes; and   2) processing the graphene suspension and metal or metal oxide so as to provide a solution comprising composite, wherein the composite is the conductive material.   
     
     
         8 . The method according to  claim 7 , wherein the step of processing the graphite oxide into a graphene suspension comprising monolayer graphene nanoflakes, comprising:
 processing the graphite oxide into a graphene suspension comprising monolayer graphene nanoflakes by utilizing a rapid thermal exfoliation method or a solvothermal method.   
     
     
         9 . The method according to  claim 7 , wherein the step of processing the graphite oxide into a graphene suspension comprising monolayer graphene nanoflakes comprising:
 subjecting the graphite oxide to a heat treatment;   adding absolute ethanol into the treated graphite oxide; and   subjecting the treated graphite oxide with absolute ethanol added therein to an ultrasonic treatment or a mechanical agitation treatment.   
     
     
         10 . The method according to  claim 9 , wherein the subjecting the graphite oxide to a heat treatment, comprising:
 heat treating the graphite oxide at a temperature of 850-1300° C. for 30-50 sec.   
     
     
         11 . The method according to  claim 7 , wherein the step of processing the graphite oxide into a graphene suspension comprising monolayer graphene nanoflakes, comprising:
 subjecting the graphite oxide to a heat treatment;   adding absolute ethanol into the treated graphite oxide; and   subjecting the graphite oxide with absolute ethanol added therein to an ultrasonic treatment, wherein the power of the ultrasonic wave is 80-150 W and the time of the ultrasonic wave treatment is 2-2.5 h.   
     
     
         12 . The method according to  claim 9 , wherein the weight ratio of the graphite oxide to the absolute ethanol is 1:20-1:100. 
     
     
         13 . The method according to  claim 7 , wherein the step of processing the graphene suspension and metal or metal oxide so as to provide a solution comprising composite, comprising:
 subjecting the graphene suspension and metal or metal oxide to an ultrasonic wave treatment or a mechanical agitation treatment so as to provide a solution comprising the composite.   
     
     
         14 . The method according to  claim 7 , wherein the step of processing the graphene suspension and metal or metal oxide so as to provide a solution comprising composite, comprising:
 mixing the graphene suspension and a solvent, so as to provide a mixture;   subjecting the mixture to ultrasonic wave dispersion, so as to provide a ultrasonically dispersed mixture; and   mixing the ultrasonically dispersed mixture and a salt solution or alkali solution comprising the metal, and then performing a mechanical agitation treatment on it, so as to provide the solution comprising the composite.   
     
     
         15 . The method according to  claim 14 , wherein the solvent is N-methyl-2-pyrrolidone. 
     
     
         16 . The method according to  claim 14 , wherein the ultrasonic wave dispersion includes dispersion of 20-60 min under an ultrasonic wave of 80-150 W. 
     
     
         17 . The method according to  claim 14 , wherein the salt solution or alkali solution is a solution comprising Al 3+  and SO 4   2− . 
     
     
         18 . The method according to  claim 14 , wherein the duration of the mechanicalagitation treatment lasts 5-10 h. 
     
     
         19 . The method according to  claim 14 , wherein the weight ratio of the graphene in the graphene suspension to the metal in the salt solution or alkali solution is 1:50-1:600. 
     
     
         20 . A liquid crystal display device comprising a conductive film, wherein the conductive film is formed of the conductive material according to  claim 1 .