Laminated graphene-based thermally conductive film and pad and method for manufacturing the film and pad
A graphene-based thermally conductive film comprising a plurality of strips of a graphene film arranged so that graphene sheets of the graphene film are aligned in a direction perpendicular to the plane of the thermally conductive film, wherein the thermally conductive film comprises: a plurality of first area portions comprising strips of graphene film having a first rotational alignment in the plane of the thermally conductive film; and a plurality of second area portions comprising strips of graphene film having a second rotational alignment in the plane of the thermally conductive film, different from the first alignment.
1 . A method of manufacturing a laminated graphene-based thermally conductive film comprising vertically aligned graphene, the method comprising:
providing a laminated film comprising a plurality of graphene film layers separated by a first adhesive, the graphene film layers comprising graphene sheets aligned with a plane of the laminated film, wherein the plane of the laminated film is a first plane (XY) defined by a first axis (X) and a second axis (Y) perpendicular to the first axis;
forming a plurality of sections of the laminated film by cutting the laminated film perpendicularly to a second plane (YZ) defined by the second axis (Y) and a third axis (Z) perpendicular to each of the first and second axes;
rotating a first subset of the plurality of sections about the first axis (X);
attaching the plurality of sections to each other using a second adhesive, such that a block is formed consisting of the first subset of the plurality of sections having a first rotational alignment about the first axis (X) that has been rotated and a second subset of the plurality of sections having a second rotational alignment about the first axis (X) that has not been rotated, the second rotational alignment being different from the first rotational alignment;
curing the second adhesive, thereby forming the block from the first and second subsets of the plurality of sections; and
cutting the block along a plane (Y′Z′) of the block, the plane of the block being defined by being perpendicular to the first axis (X), thereby forming the laminated graphene-based thermally conductive film aligned perpendicularly to the plane (Y′Z′) of the thermally conductive film such that a first plurality of area portions of the laminated graphene-based thermally conductive film has the first rotational alignment about the first axis (X), and a second plurality of area portions of the laminated graphene-based thermally conductive film has the second rotational alignment about the first axis (X).
2 . The method according to claim 1 , wherein the cutting the laminated film comprises cutting square sections, and
wherein the rotating the first subset of the plurality of sections comprises rotating every other section of the plurality of sections 90° about the first axis (X).
3 . The method according to claim 1 , wherein the cutting the laminated film comprises cutting hexagonal sections, and
wherein the rotating the first subset of the plurality of sections comprises rotating each section ±60° or ±120° compared to each neighboring one of hexagonal sections such that no two adjacent ones of the hexagonal sections have a same rotational alignment about the first axis.
4 . The method according to claim 1 , wherein the cutting of the laminated film is by wire cutting, sawing or laser cutting.
5 . The method according to claim 1 , wherein the curing the second adhesive comprises applying pressure and heat to the block.