METHOD FOR SYNTHESIS OF LARGE AREA THIN FILMS
Improved methods for synthesizing large area thin films are disclosed, which result in films of enhanced width. The methods comprise providing a separator material which is rolled or wound up, along with the metallic foil substrate on which the thin film is to be deposited, to form a coiled composite which is then subjected to conventional chemical vapor deposition. Optionally, a winding tool may be used to aid in the rolling process. The methods enable a many-fold increase in the effective width of the substrate to be achieved.
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11 . In a method for synthesizing a thin film using chemical vapor deposition, said method comprising the steps of heating a substantially flat substrate, forming a thin film on a surface of said substrate by exposing the substrate to chemical vapor deposition, and cooling the substrate to room temperature, the improvement comprising, prior to said heating step, providing a separator material, positioning said separator material adjacent to and in a substantially overlying relationship with said substrate to form a composite in which a layer of separator material is interleaved between adjacent layers of said substrate, and winding said composite so as to provide a coiled composite;
wherein the thin film is selected from the group consisting of graphene and boron nitride.
12 . The method of claim 11 wherein said separator material is comprised of a substance selected from the group consisting of fused quartz wool, ceramic insulation and a silica fabric.
13 . The method of claim 12 wherein said separator material is provided in the form of a substantially flat mat, and wherein the thickness of said mat is in the range of from approximately 0.1 mm to approximately 2 mm.
14 . The method of claim 13 wherein said separator material is comprised of fused quartz wool.
15 . The method of claim 11 wherein the winding step is accomplished with the aid of a winding tool.
16 . The method of claim 15 wherein said winding tool is comprised of fused quartz.
17 . The method of claim 16 wherein said winding tool is substantially cylindrical in shape, and wherein the form of said winding tool is selected from the group consisting of a hollow tube and a solid rod.
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19 . The method of claim 19 wherein the substrate is comprised of a metallic foil.
20 . The method of claim 19 wherein the thin film is graphene, and wherein said metallic foil is comprised of copper.