DEBONDING AND TRANSFER TECHNIQUES FOR HETERO-EPITAXIALLY GROWN GRAPHENE, AND PRODUCTS INCLUDING THE SAME

• US 20120312693A1
• Filed: 07/11/2012
• Published: 12/13/2012
• Est. Priority Date: 08/07/2009
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: VEERASAMY, Vijayen S.
• Granted Patent: US 8,591,680 B2
• Time in Patent Office: Days
• US Class Current: 205/188
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 32/188 by epitaxial growth
• CPC Class Codes: C01B 32/194 After-treatment
• CPC Class Codes: C25F 5/00 Electrolytic stripping of metallic layers or coatings
• CPC Class Codes: C30B 29/02 Elements
• CPC Class Codes: C30B 33/00 After-treatment of single crystals or homogeneous polycrystalline material with defined structure C30B31/00 takes precedence

Abstract

Certain example embodiments of this invention relate to the use of graphene as a transparent conductive coating (TCC). In certain example embodiments, graphene thin films grown on large areas hetero-epitaxially, e.g., on a catalyst thin film, from a hydrocarbon gas (such as, for example, C₂H₂, CH₄, or the like). The graphene thin films of certain example embodiments may be doped or undoped. In certain example embodiments, graphene thin films, once formed, may be lifted off of their carrier substrates and transferred to receiving substrates, e.g., for inclusion in an intermediate or final product. Graphene grown, lifted, and transferred in this way may exhibit low sheet resistances (e.g., less than 150 ohms/square and lower when doped) and high transmission values (e.g., at least in the visible and infrared spectra).

Claims

1-21. -21. (canceled)

22. A method of disposing a graphene thin film over a target receiving substrate, the method comprising:

hetero-epitaxially growing the graphene thin film on a catalyst thin film comprising metal;

disposing the graphene thin film and the catalyst thin film, directly or indirectly, on the target receiving substrate; and

after said disposing, anodizing the catalyst thin film so as to render the catalyst thin film a substantially transparent metal oxide.

23. The method of claim 22, wherein during the anodizing, the graphene thin film is caused to act as a cathode as the metal catalyst thin film is anodized.

24. The method of claim 22, wherein the metal catalyst film comprises nickel.

25. The method of claim 22, wherein the metal catalyst film comprises nickel and chromium.

26. The method of claim 22, wherein the metal catalyst film comprises 3-15% chromium.

27. The method of claim 22, wherein the metal catalyst film comprises vanadium.

28. The method of claim 22, wherein the metal catalyst film is supported by a back support.

29. The method of claim 28, wherein the back support comprises glass.

30. The method of claim 28, wherein the back support comprises a silicon wafer.

31. The method of claim 28, wherein the back support comprises zirconium.

32. A method of isolating a graphene thin film, the method comprising:

hetero-epitaxially growing the graphene thin film on a catalyst thin film supported by a substrate, wherein a release layer is located between the substrate and the catalyst thin film;

disposing a polymer-based coating on the graphene thin film on a surface thereof opposite the catalyst thin film;

curing the polymer-based coating;

releasing the catalyst thin film, the graphene thin film, and the polymer-based coating from the substrate via the release layer; and

causing the graphene thin film and the polymer-based coating to be released from the catalyst thin film.

33. The method of claim 32, wherein the catalyst thin film is disposed on a back support substrate, the back support substrate being formed on the catalyst thin film on a surface thereof opposite the graphene thin film, and wherein the release layer is disposed between the back support substrate and the catalyst thin film.

34. The method of claim of claim 32, wherein the release layer comprises zinc oxide.

35. The method of claim 32, wherein the graphene thin film and the polymer-based coating are released from at least the substrate by chemically inducing the release layer.