US2010000441A1PendingUtilityA1

Nano graphene platelet-based conductive inks

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Individually held — no corporate assignee on recordPriority: Jul 1, 2008Filed: Jul 1, 2008Published: Jan 7, 2010
Est. expiryJul 1, 2028(~2 yrs left)· nominal 20-yr term from priority
Inventors:Bor Z. JangAruna Zhamu
H05K 2201/0245H05K 1/097C09D 11/52H05K 2201/0323C09D 11/38C09D 11/037C09D 11/102H05K 9/0092H05K 2201/10098H05K 1/0259C09D 11/30H05K 1/0212B82Y 30/00H01B 1/04
57
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Claims

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. 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.

Claims

exact text as granted — not AI-modified
1 . A nano graphene platelet-based conductive ink that is printable, comprising:
 (a) nano graphene platelets wherein each of the platelets comprises a graphene sheet or multiple graphene sheets and the platelets have a 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.   
     
     
         2 . The conductive ink as set forth in  claim 1  wherein the graphene platelets have an average thickness less than 10 nm. 
     
     
         3 . The conductive ink as set forth in  claim 1  wherein the graphene platelets have an average thickness no greater than 1 nm. 
     
     
         4 . The conductive ink as set forth in  claim 1  wherein the nano graphene platelets comprise a non-oxidized graphene platelet. 
     
     
         5 . The conductive ink as set forth in  claim 1  further comprising a surfactant and/or a binder material. 
     
     
         6 . The conductive ink as set forth in  claim 2  further comprising a surfactant and/or a binder material. 
     
     
         7 . The conductive ink as set forth in  claim 1  further comprising a binder or matrix material selected from a thermoplastic, a thermoset resin, a conductive organic substance, a petroleum or coal tar pitch, or a combination thereof. 
     
     
         8 . The conductive ink as set forth in  claim 1  wherein the graphene platelets occupy a proportion of at least 3% by volume based on the total ink volume. 
     
     
         9 . The conductive ink as set forth in  claim 2  wherein the graphene platelets occupy a proportion of at least 10% by volume based on the total ink volume. 
     
     
         10 . The conductive ink as set forth in  claim 1  wherein the graphene platelets occupy a proportion of at least 40% by volume based on the total ink volume. 
     
     
         11 . 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. 
     
     
         12 . The conductive ink as set forth in  claim 1  further comprising carbon nanotubes in an amount of less than 1% by volume based on the total conductive ink volume. 
     
     
         13 . 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. 
     
     
         14 . The conductive ink as set forth in  claim 1  wherein said ink is inkjet printable. 
     
     
         15 . The conductive ink as set forth in  claim 1  wherein said ink is screen printable. 
     
     
         16 . The conductive ink as set forth in  claim 1  wherein a viscosity of said ink is less than 500 mPaS. 
     
     
         17 . The conductive ink as set forth in  claim 1  wherein a viscosity of said ink is less than 100 mPaS. 
     
     
         18 . The conductive ink as set forth in  claim 1  wherein a viscosity of said ink is less than 30 mPaS. 
     
     
         19 . 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. 
     
     
         20 . 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). 
     
     
         21 . 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). 
     
     
         22 . 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). 
     
     
         23 . A nano graphene platelet-based conductive ink that is printable, comprising:
 (a) nano graphene platelets that have an average thickness no greater than 10 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.   
     
     
         24 . The conductive ink as set forth in  claim 23  further comprising a surfactant and/or a binder material. 
     
     
         25 . The conductive ink as set forth in  claim 23  wherein said ink is inkjet printable and a viscosity of said ink is less than 500 mPaS. 
     
     
         26 . The conductive ink as set forth in  claim 23  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. 
     
     
         27 . The conductive ink as set forth in  claim 23  wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 10 W/(mK). 
     
     
         28 . A nano graphene platelet-based conductive ink that is printable, comprising:
 (a) non-oxidized or pristine nano graphene platelets, 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.   
     
     
         29 . The conductive ink as set forth in  claim 28  further comprising a surfactant and/or a binder material. 
     
     
         30 . The conductive ink as set forth in  claim 28  wherein said ink is inkjet printable and a viscosity of said ink is less than 500 mPaS. 
     
     
         31 . The conductive ink as set forth in  claim 28  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. 
     
     
         32 . The conductive ink as set forth in  claim 28  wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 10 W/(mK). 
     
     
         33 . The conductive ink as set forth in  claim 28  wherein said ink, after printing onto a solid substrate to form a solid component, provides a thermal conductivity of at least 100 W/(mK).

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