Patent ID: 9580325
Date: 2017-02-28
CPC Classifications: B29K,B29L,B32B,B82Y,C01B,C09K

Claim:
1. A process for producing a highly oriented graphene film (HOGF) with a thickness no greater than 0.1 mm, said process comprising: (a) preparing either a graphene oxide dispersion having graphene oxide sheets dispersed in a fluid medium or a graphene oxide gel having graphene oxide molecules dissolved in a fluid medium, wherein said graphene oxide sheets or graphene oxide molecules contain an oxygen content higher than 5% by weight; (b) dispensing and depositing said graphene oxide dispersion or graphene oxide gel onto a surface of a supporting substrate to form a first layer of graphene oxide, wherein said dispensing and depositing procedure includes subjecting said graphene oxide dispersion or graphene oxide gel to an orientation-inducing stress; (c) partially or completely removing said fluid medium from the first layer of graphene oxide to form a first dried layer of graphene oxide having a layer thickness less than 200 μm and having an inter-plane spacing d (d) preparing at least a second dried layer of graphene oxide by repeating steps (b) and (c) at least one time or preparing multiple sheets of dried graphene oxide by slicing said first dried layer of graphene oxide; (e) stacking either said first dried layer of graphene oxide with said at least the second dried layer of graphene oxide or said multiple sheets of dried graphene oxide under an optional first compressive stress to form a mass of multiple layers of graphene oxide; and (f) heat treating the mass of multiple layers of graphene oxide under an optional second compressive stress to produce said highly oriented graphene film at a first heat treatment temperature higher than 100° C. to an extent that an inter-plane spacing d