Graphene oxide nanocomposite membrane having improved gas barrier characteristics and method for manufacturing the same

Abstract

The present invention relates to a technique of manufacturing a graphene oxide nanocomposite membrane in which 3 μm to 5 μm-sized graphene oxide is coated with a thickness of 10 nm or more on various supports, or a graphene oxide nanocomposite membrane having a structure in which graphene oxide is inserted into a polymer. The graphene oxide nanocomposite membrane manufactured according to the present invention has excellent barrier characteristics against various gases even when graphene oxide, of which the size is controlled to 3 μm to 5 μm, is coated as a nanometer-thick thin film on various supports or the graphene oxide nanocomposite membrane has a simple structure in which graphene oxide is inserted into a polymer, and thus the graphene oxide nanocomposite membrane can be applied to the packaging of display devices, food, and medical products.

1 . A graphene oxide nanocomposite membrane with gas barrier characteristics comprising:
 a support; and   a coating layer comprising 3 μm to 50 μm-sized graphene oxide coated to a thickness of 10 nm or more on the support and having nanopores.   
     
     
         2 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 , wherein the support comprises any one selected from the group consisting of polymer, ceramic, glass, paper and metal layers. 
     
     
         3 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 2 , wherein the polymer comprises any one selected from the group consisting of polyester, polyolefin, polyvinyl chloride, polyurethane, polyacrylate, polycarbonate, polytetrafluoroethylene, polysulfone, polyether sulfone, polyimide, polyether imide, polyamide, polyacrylonitrile, cellulose acetate, cellulose triacetate and polyvinylidene fluoride. 
     
     
         4 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 2 , wherein the ceramic comprises any one selected from the group consisting of alumina, magnesia, zirconia, silicon carbide, tungsten carbide and silicon nitride. 
     
     
         5 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 2 , wherein the metal layer is a metal foil, a metal sheet or a metal film. 
     
     
         6 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 5 , wherein the metal layer comprises any one material selected from the group consisting of copper, nickel, iron, aluminum and titanium. 
     
     
         7 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 , wherein the graphene oxide is functionalized graphene oxide in which a hydroxyl group, a carboxyl group, a carbonyl group or an epoxy group present in graphene oxide is converted into an ester group, an ether group, an amide group or an amino group. 
     
     
         8 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 , wherein the nanopores have a mean diameter of 0.5 nm to 1.0 nm. 
     
     
         9 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 , wherein the coating layer comprises graphene oxide including a single layer or multiple layers. 
     
     
         10 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 9 , wherein the graphene oxide including a single layer has a thickness of 0.6 nm to 1 nm. 
     
     
         11 . A graphene oxide nanocomposite membrane with gas barrier characteristics having a structure in which graphene oxide is inserted into a polyethylene glycol diacrylate or polyethylene glycol dimethacrylate polymer. 
     
     
         12 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 11 , wherein the graphene oxide has a size of 100 to 1000 nm. 
     
     
         13 . The graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 11 , wherein graphene oxide is present in an amount of 5% by weight in the nanocomposite membrane. 
     
     
         14 . A method of manufacturing a graphene oxide nanocomposite membrane with gas barrier characteristics comprising:
 i) dispersing graphene oxide in distilled water and treating the dispersion with an ultrasonic grinder for 0.1 to 6 hours to obtain a graphene oxide dispersion;   ii) centrifuging the dispersion to form graphene oxide having a controlled size of 3 μm to 50 μm;   iii) dispersing the graphene oxide formed in step ii) in distilled water again to obtain a graphene oxide dispersion; and   iv) coating a support with the dispersion obtained in step iii) to form a coating layer having nanopores.   
     
     
         15 . The method according to  claim 14 , wherein the graphene oxide is functionalized graphene oxide in which a hydroxyl group, a carboxyl group, a carbonyl group or an epoxy group present in graphene oxide is converted into an ester group, an ether group, an amide group or an amino group. 
     
     
         16 . The method according to  claim 14 , wherein the support comprises any one selected from the group consisting of polymer, ceramic, glass, paper and metal layers. 
     
     
         17 . The method according to  claim 16 , wherein the polymer comprises any one selected from the group consisting of polyester, polyolefin, polyvinyl chloride, polyurethane, polyacrylate, polycarbonate, polytetrafluoroethylene, polysulfone, polyether sulfone, polyimide, polyether imide, polyamide, polyacrylonitrile, cellulose acetate, cellulose triacetate and polyvinylidene fluoride. 
     
     
         18 . The method according to  claim 16 , wherein the ceramic comprises any one selected from the group consisting of alumina, magnesia, zirconia, silicon carbide, tungsten carbide and silicon nitride. 
     
     
         19 . The method according to  claim 16 , wherein the metal layer is a metal foil, a metal sheet or a metal film. 
     
     
         20 . The method according to  claim 19 , wherein the metal layer comprises any one material selected from the group consisting of copper, nickel, iron, aluminum and titanium. 
     
     
         21 . The method according to  claim 14 , wherein the coating is carried out by any one method selected from the group consisting of direct evaporation, transfer, spin coating and spray coating. 
     
     
         22 . The method according to  claim 21 , wherein the spin coating is conducted three to ten times. 
     
     
         23 . The method according to  claim 14 , wherein the nanopores have a mean diameter of 0.5 nm to 1.0 nm. 
     
     
         24 . The method according to  claim 14 , wherein the coating layer comprises graphene oxide including a single layer or multiple layers. 
     
     
         25 . The method according to  claim 24 , wherein the graphene oxide including a single layer has a thickness of 0.6 nm to 1 nm. 
     
     
         26 . A display device comprising the graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 . 
     
     
         27 . A food packaging material comprising the graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 . 
     
     
         28 . A medical product packaging material comprising the graphene oxide nanocomposite membrane with gas barrier characteristics according to  claim 1 .