# US 2019/0380201 A1 · Patterned nano graphene platelet-based conductive inks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0380201 A1 - Document ID: US20190380201A1 - Status: Published application - Kind: A1 - Application number: 16/519,275 - Filed: 2019-07-23 - Published: 2019-12-12 - Earliest claimed: 2008-07-01 - Assignees: Global Graphene Group, Inc. - Applicants: Global Graphene Group, Inc. - Inventors: Aruna Zhamu; Bor Z. Jang - Web page: https://patentgrep.com/patent/US20190380201A1 ## CPC - H05K 1/097: {Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence)} - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - C09D 11/037: characterised by the pigment - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - C09D 11/30: Inkjet printing inks - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - C09D 11/52: Electrically conductive inks - H01B 1/04: mainly consisting of carbon-silicon compounds, carbon or silicon - H05K 1/0212: {Printed circuits or mounted components having integral heating means} - H05K 1/0259: {Electrostatic discharge [ESD] protection} - H05K 9/0092: {comprising electro-conductive pigments, e.g. paint, ink, tampon printing} - H05K 2201/0245: Flakes, flat particles or lamellar particles - H05K 2201/0323: Carbon - H05K 2201/10098: Components for radio transmission, e.g. radio frequency identification [RFID] tag, printed or non-printed antennas - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - 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) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract A nano graphene platelet-based conductive ink comprising: (a) nano graphene platelets (preferably un-oxidized or pristine graphene), and (b) a liquid medium in which the nano graphene platelets are dispersed, wherein the nano graphene platelets occupy a proportion of at least 0.001% by volume based on the total ink volume and a process using the same. The ink can also contain a binder or matrix material and/or a surfactant. The ink may further comprise other fillers, such as carbon nanotubes, carbon nano-fibers, metal nano particles, carbon black, conductive organic species, etc. The graphene platelets preferably have an average thickness no greater than 10 nm and more preferably no greater than 1 nm. These inks can be printed to form a range of electrically or thermally conductive components or printed electronic components. ## Claims ### Claim 1 A nano graphene platelet-based conductive ink that is printable, comprising: (a) pristine nano graphene platelets wherein each of said platelets has never previously been oxidized, comprises a graphene sheet or multiple graphene sheets, and said platelets have an average thickness no greater than 100 nm, and (b) a liquid medium in which said nano graphene platelets are dispersed, wherein said nano graphene platelets occupy a proportion of at least 0.001% by volume based on the total ink volume, and wherein said ink is formulated such that it is capable of being printed in patterns by means of ink jet printing or screen printing. ### Claim 2 (depends on 1) The conductive ink as set forth in claim 1 wherein said graphene platelets have an average thickness no greater than 1 nm. ### Claim 3 (depends on 1) The conductive ink as set forth in claim 1 wherein said graphene platelets occupy a proportion of at least 3% by volume based on the total ink volume. ### Claim 4 (depends on 1) The conductive ink as set forth in claim 1 wherein said graphene platelets occupy a proportion of at least 10% by volume based on the total ink volume. ### Claim 5 (depends on 1) The conductive ink as set forth in claim 1 wherein said graphene platelets occupy a proportion of at least 40% by volume based on the total ink volume. ### Claim 6 (depends on 1) The conductive ink as set forth in claim 1 further comprising a conductive additive selected from the group consisting of carbon nanotubes, carbon nano-fibers, carbon black, fine graphite particles, nano-scaled metal particles, conductive organic species, and combinations thereof. ### Claim 7 (depends on 1) The conductive ink as set forth in claim 1 further comprising carbon nanotubes in an amount of less than 5% by volume based on the total conductive ink volume. ### Claim 8 (depends on 1) The conductive ink as set forth in claim 1 wherein said ink is inkjet printable. ### Claim 9 (depends on 1) The conductive ink as set forth in claim 1 wherein said ink is screen printable. ### Claim 10 (depends on 1) The conductive ink as set forth in claim 1 wherein a viscosity of said ink is less than 500 mPaS. ### Claim 11 (depends on 1) The conductive ink as set forth in claim 1 wherein a viscosity of said ink is less than 100 mPaS. ### Claim 12 (depends on 1) The conductive ink as set forth in claim 1 wherein a viscosity of said ink is less than 30 mPaS. ### Claim 13 (depends on 1) The conductive ink as set forth in claim 1 wherein a viscosity of said ink is less than 200 PaS and said ink contains no less than 20% by volume of nano graphene platelets. ### Claim 14 (depends on 1) The conductive ink as set forth in claim 1 wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 10 W/(mK). ### Claim 15 (depends on 1) The conductive ink as set forth in claim 1 wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 100 W/(mK). ### Claim 16 (depends on 1) The conductive ink as set forth in claim 1 wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 200 W/(mK). ### Claim 17 (depends on 1) The conductive ink as set forth in claim 1 further comprising a surfactant, binder material, matrix material, or combination thereof. ### Claim 18 (depends on 17) The conductive ink as set forth in claim 17 where said binder material or matrix material is selected from a thermoplastic, a thermoset resin, a conductive organic substance, petroleum or coal tar pitch, or a combination thereof. ### Claim 19 (depends on 1) The conductive ink of claim 1 wherein said nano-graphene platelets are non-covalently functionalized with a linear polymer. ### Claim 20 (depends on 19) The conductive ink of claim 19 wherein said linear polymer is polyvinyl pyrrolidone, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), polystyrene sulfonate, or a combination thereof. ### Claim 21 (depends on 1) The conductive ink as set forth in claim 1 wherein said graphene platelets have an average thickness of less than 10 nm. ### Claim 22 (depends on 21) The conductive ink as set forth in claim 21 further comprising a surfactant, binder material, matrix material, or combination thereof. ### Claim 23 (depends on 1) A patterned RFID device comprised of the ink of claim 1 printed on a substrate. ### Claim 24 (depends on 1) A thin film, flexible substrate, or paper coated with the ink of claim 1 for electromagnetic interference (EMI) shielding or electrostatic charge dissipation (ESD) applications, wherein said ink is patterned. ### Claim 25 (depends on 1) A thermal interface material comprising the ink of claim 1, where said ink is printed onto a plastic, elastomer, or metal substrate, and said substrate may be planar or non-planar, and wherein said printed ink has a thermal conductivity greater than 10 W/m.K.