# US 9,520,241 B2 · Graphene supported vanadium oxide monolayer capacitor material and method of making the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,241 B2 - Document ID: US9520241B2 - Status: Granted - Kind: B2 - Application number: 14/850,118 - Filed: 2015-09-10 - Published: 2016-06-30 - Granted: 2016-12-13 - Earliest claimed: 2012-10-31 - Assignees: Indiana University Research and Technology Corporation - Applicants: Indiana University Research and Technology Corporation - Inventors: Jian Xie - Web page: https://patentgrep.com/patent/US9520241B2 ## CPC - H01G 11/32: Carbon-based - H01G 11/26: characterised by their structure, e.g. multi-layered, porosity or surface features - H01G 11/36: Nanostructures, e.g. nanofibres, nanotubes or fullerenes - H01G 11/46: Metal oxides - H01G 11/68: characterised by their material - H01G 11/86: specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) - H01G 11/34: characterised by carbonisation or activation of carbon - Y02E 60/13: Energy storage using capacitors - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An method of producing an electronic device, including identifying a graphene sheet, functionalizing the graphene sheet to yield a functionalized sheet, attaching respective vanadium oxide molecules to respective functional groups to define an impregnated graphene sheet, removing organic solvents from the impregnated graphene sheet to define a composite sheet, and positioning the composite sheet onto a metallic substrate to yield a capacitor. ## Claims ### Claim 1 A capacitor, comprising: a plurality of hydroxyl functionalized graphene sheets defining a stack; a plurality of V2O5 molecules individually bonded a each respective hydroxyl functionalized graphene sheet and defining a V2O5 monolayer, each respective V2O5 monolayer bonded to a respective hydroxyl functionalized graphene sheet; at least one metallic electrode connected in electric communication to the stack; wherein each respective V2O5 monolayer is disposed between two respective graphene sheets; wherein each respective graphene sheet is an atomic monolayer; wherein the mass ratio of graphene to V2O5 in the stack is greater than 3. ### Claim 2 (depends on 1) The capacitor of claim 1 and further comprising a plurality of carbon spacers disposed on each respective graphene sheet. ### Claim 3 (depends on 2) The capacitor of claim 2 wherein the carbon spacers are amorphous carbon. ### Claim 4 (depends on 2) The capacitor of claim 2 wherein the carbon spacers are diamond. ### Claim 5 (depends on 1) The capacitor of claim 1 wherein the mass ratio of graphene to V2O5 in the stack is about 3.8. ### Claim 6 A method of producing an electronic device, comprising: a) identifying a graphene sheet; b) functionalizing the graphene sheet to yield a functionalized sheet; c) attaching respective vanadium oxide molecules to respective functional groups to define an impregnated graphene sheet; d) removing organic solvents from the impregnated graphene sheet to define a composite sheet; and e) positioning the composite sheet onto a metallic substrate to yield a capacitor. ### Claim 7 (depends on 6) The method of claim 6 wherein during step a), a plurality of graphene sheets are identified; wherein during step b) a plurality of functionalized sheets are yielded; wherein during step c), a plurality of impregnated graphene sheets are defined; wherein during step d), a plurality of composite sheets are defined; and wherein during step e), a plurality of composite sheets are positioned onto the metallic substrate to yield a capacitor. ### Claim 8 (depends on 7) The method of claim 7 wherein step b) includes a diazonium reaction. ### Claim 9 (depends on 7) The method of claim 7 wherein step d) includes calcining. ### Claim 10 (depends on 7) The method of claim 7 wherein the graphene sheet is an atomic monolayer. ### Claim 11 (depends on 7) The method of claim 7 wherein the functionalized sheet is functionalized with hydroxyl groups. ### Claim 12 (depends on 7) The method of claim 7 and further comprising: f) positioning a plurality of carbonaceous spacers onto the graphene sheet. ### Claim 13 (depends on 12) The method of claim 12 wherein the carbonaceous spacers are amorphous. ### Claim 14 (depends on 12) The method of claim 12 wherein the carbonaceous spacers are diamond. ### Claim 15 (depends on 12) The method of claim 12 wherein the vanadium oxide molecules define a monolayer on the capacitor. ### Claim 16 A method for manufacturing a supercapacitor, comprising: a) identifying a plurality of graphene sheets; b) functionalizing the respective graphene sheets with a diazonium reaction to yield a plurality of hydroxyl-functionalized sheets; c) attaching respective vanadium oxide molecules to respective hydroxyl functional groups to yield a plurality of impregnated graphene sheets; d) calcining the plurality of impregnated graphene sheets to remove organic solvents therefrom; e) bonding the vanadium oxide molecules directly to the respective graphene sheets to yield a plurality of composite sheets; and f) positioning the respective composite sheets in electric communication with each other and/or a metallic substrate to yield a capacitor. ### Claim 17 (depends on 16) The method of claim 16 and further comprising: before performing f), g) dispersing the plurality of composite sheets in an organic solvent; wherein step f) includes coating the dispersion onto a metallic substrate to form a thin layer.