US2012244358A1PendingUtilityA1

Dry Graphene Transfer from Metal Foils

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Assignee: LOCK EVGENIYA HPriority: Mar 22, 2011Filed: Mar 22, 2012Published: Sep 27, 2012
Est. expiryMar 22, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Evgeniya H. LockScott G. WaltonMira BaraketMatthew LaskoskiPaul E. SheehanShawn P. MulvaneyDaniel R. Hines
Y10T428/31786Y10T428/31931C01B 32/194Y10T428/31507B82Y 30/00B82Y 40/00C01B 32/186
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Claims

Abstract

A method for dry graphene transfer comprising growing graphene on a growth substrate, chemically modifying a transfer substrate to enhance its adhesion to graphene, contacting the graphene on the growth substrate with the transfer substrate and transfer printing; and separating the transfer substrate with attached graphene from the growth substrate. The growth substrate may be copper foil. The transfer substrate may be a polymer, such as polystyrene or polyethylene, or an inorganic substrate. Also disclosed is the related composite material made by this process.

Claims

exact text as granted — not AI-modified
1 . A method for dry graphene transfer comprising:
 growing graphene on a growth substrate;   chemically modifying a transfer substrate to enhance its adhesion to graphene;   contacting the graphene on the growth substrate with the transfer substrate and transfer printing; and   separating the transfer substrate with attached graphene from the growth substrate.   
     
     
         2 . The method of  claim 1 , wherein chemically modifying the transfer substrate comprises a plasma modification step followed by a molecule deposition step. 
     
     
         3 . The method of  claim 2 , wherein the plasma produces OH, COOH, a combination of OH and COOH, or NH 2  groups on the surface of the transfer substrate. 
     
     
         4 . The method of  claim 2 , wherein the molecule to be deposited is selected based on the transfer substrate. 
     
     
         5 . The method of  claim 4 , wherein the transfer substrate comprises SiO 2 , Al 2 O 3 , GaN, or SiC and the molecule comprises an azide molecule with a phosphate end group. 
     
     
         6 . The method of  claim 4 , wherein the transfer substrate comprises a polymer and the molecule comprises an azide molecule with an NH 2  end group. 
     
     
         7 . The method of  claim 1 , wherein the growth substrate comprises copper foil. 
     
     
         8 . The method of  claim 1 , when the growth substrate comprises a transition metal foil. 
     
     
         9 . The method of  claim 8 , wherein the transition metal foil comprises ruthenium, iridium, nickel, or any combination thereof. 
     
     
         10 . The method of  claim 1 , wherein the growth substrate comprises silicon carbide or boron nitride. 
     
     
         11 . The method of  claim 1 , wherein the transfer substrate comprises a polymer. 
     
     
         12 . The method of  claim 1 , wherein the transfer substrate comprises a homopolymer. 
     
     
         13 . The method of  claim 12  wherein the homopolymer comprises polystyrene, polyethylene, polypropylene, or any combination thereof. 
     
     
         14 . The method of  claim 1 , wherein the transfer substrate comprises an oxygen containing polymer, a nitrogen containing polymer, or both. 
     
     
         15 . The method of  claim 1 , wherein the transfer substrate comprises a polyester, polyacrylate, polycarbonate, or any combination thereof. 
     
     
         16 . The method of  claim 1 , wherein the transfer substrate comprises an inorganic substrate. 
     
     
         17 . The method of  claim 1 , wherein the transfer substrate comprises SiO 2 , Al 2 O 3 , GaN, or SiC. 
     
     
         18 . A composite material made by the process comprising the steps of:
 growing graphene on a growth substrate;   chemically modifying a transfer substrate to enhance its adhesion to graphene;   contacting the graphene on the growth substrate with the transfer substrate and transfer printing by application of heat and pressure or by exposure to UV light; and   separating the transfer substrate with attached graphene from the growth substrate.   
     
     
         19 . The composite material of  claim 18 , wherein chemically modifying the transfer substrate comprises a plasma modification step followed by a molecule deposition step. 
     
     
         20 . The composite material of  claim 19 , wherein the plasma produces OH, COOH, a combination of OH and COOH, or NH 2  groups on the surface of the transfer substrate. 
     
     
         21 . The composite material of  claim 18 , wherein the molecule to be deposited is selected based on the transfer substrate. 
     
     
         22 . The composite material of  claim 21 , wherein the transfer substrate comprises SiO 2 , Al 2 O 3 , GaN, or SiC and the molecule comprises an azide molecule with a phosphate end group. 
     
     
         23 . The composite material of  claim 21 , wherein the transfer substrate comprises a polymer and the molecule comprises an azide molecule with an NH 2  end group. 
     
     
         24 . The composite material of  claim 18 , wherein the growth substrate comprises copper foil. 
     
     
         25 . The composite material of  claim 18 , when the growth substrate comprises a transition metal foil. 
     
     
         26 . The composite material of  claim 25 , wherein the transition metal foil comprises ruthenium, iridium, nickel, or any combination thereof. 
     
     
         27 . The composite material of  claim 18 , wherein the growth substrate comprises silicon carbide or boron nitride. 
     
     
         28 . The composite material of  claim 18 , wherein the transfer substrate comprises a polymer. 
     
     
         29 . The composite material of  claim 18 , wherein the transfer substrate comprises a homopolymer. 
     
     
         30 . The composite material of  claim 29 , wherein the homopolymer comprises polystyrene, polyethylene, polypropylene, or any combination thereof. 
     
     
         31 . The composite material of  claim 18 , wherein the transfer substrate comprises an oxygen containing polymer, a nitrogen containing polymer, or both. 
     
     
         32 . The composite material of  claim 18 , wherein the transfer substrate comprises a polyester, polyacrylate, polycarbonate, or any combination thereof. 
     
     
         33 . The composite material of  claim 18 , wherein the transfer substrate comprises an inorganic substrate. 
     
     
         34 . The composite material of  claim 18 , wherein the transfer substrate comprises SiO 2 , Al 2 O 3 , GaN, or SiC.

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