# US 2017/0253532 A1 · Method for manufacturing flexible graphene electrically conductive film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0253532 A1 - Document ID: US20170253532A1 - Status: Published application - Kind: A1 - Application number: 15/085,992 - Filed: 2016-03-30 - Published: 2017-09-07 - Earliest claimed: 2016-03-02 - Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd. - Inventors: Xuanyun Wang - Web page: https://patentgrep.com/patent/US20170253532A1 ## CPC - C04B 35/62218: {obtaining ceramic films, e.g. by using temporary supports} - C01B 32/182: Graphene - C04B 35/522: {Graphite (C04B35/536 takes precedence)} - C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)} - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract A method for manufacturing a flexible graphene electrically conductive film includes (1) providing a base and forming a graphene layer on a surface of the base; (2) providing polyvinyl alcohol, dissolving polyvinyl alcohol in water and heating to form a colloidal solution, which after cooling, forms a polyvinyl alcohol colloidal solution; and coating the polyvinyl alcohol colloidal solution on a surface of the graphene layer and drying so as to form a supporting layer on the surface of the graphene layer; (3) removing the base from the graphene layer; and (4) dissolving the supporting layer on the graphene layer in water so as to obtain a flexible graphene electrically conductive film that is free of surface residue. ## Claims ### Claim 1 A method for manufacturing a flexible graphene electrically conductive film, comprising the following steps: (1) providing a base and forming a graphene layer on a surface of the base; (2) providing polyvinyl alcohol, dissolving polyvinyl alcohol in water and heating to form a colloidal solution, which after cooling, forms a polyvinyl alcohol colloidal solution; and coating the polyvinyl alcohol colloidal solution on a surface of the graphene layer and drying so as to form a supporting layer on the surface of the graphene layer; (3) removing the base from the graphene layer to obtain the graphene layer that is covered with the supporting layer; and (4) placing the graphene layer that is covered with the supporting layer in water to allow the supporting layer on the surface of the graphene layer to dissolve in water thereby obtaining a flexible graphene electrically conductive film that is free of surface residue. ### Claim 2 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein the base is made of a material comprising a metal; and step (1) applies a chemical vapor deposition process to heat the base and at the same time supplies a hydrocarbon gas and a carrier gas to the surface of the base so as to form the graphene layer on the surface of the base. ### Claim 3 (depends on 2) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 2, wherein the base is formed of a material comprising copper, nickel, or ruthenium; the hydrocarbon gas is methane; and the carrier gas is hydrogen. ### Claim 4 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein step (2) applies a spin coating process to coat the polyvinyl alcohol colloidal solution on the surface of the graphene layer. ### Claim 5 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein in step (2), the base on which the polyvinyl alcohol colloidal solution is coated is placed on a heating board for drying, wherein the temperature range of the heating board is 100° C.-250° C. ### Claim 6 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein step (3) applies a solution-based process to have the base dissolved in a corrosive liquid in order to remove the base from the graphene layer. ### Claim 7 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein step (3) applies an electrochemical process to corrode off the base so as to remove the base from the graphene layer. ### Claim 8 (depends on 7) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 7, wherein step (3) comprises: providing a first electrode on the base to cover the supporting layer and the graphene layer; arranging, in sequence, a solid electrolyte and a second electrode on an under surface of the base; electrically connecting the first electrode and the second electrode to positive and negative electrodes of a power supply to conduct an electrochemical reaction to corrode off the base in order to remove the base from the graphene layer. ### Claim 9 (depends on 8) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 8, wherein the first electrode and the second electrode are both graphite electrodes. ### Claim 10 (depends on 1) The method for manufacturing a flexible graphene electrically conductive film as claimed in claim 1, wherein step (3) applies a mechanical separation process to strip the base off the graphene layer so as to remove the base from the graphene layer.