Patent ID: 9156700
Filing Date: 2015-10-13
Classification: C01B

Abstract:
1. A process for producing a unitary graphene material, said process comprising: (a) preparing a graphene oxide gel having graphene oxide molecules dissolved in a fluid medium wherein said graphene oxide molecules contain an oxygen content higher than 20% by weight; (b) dispensing and depositing a layer of said graphene oxide gel onto a surface of a supporting substrate to form a deposited graphene oxide gel thereon, wherein said dispensing and depositing procedure includes shear-induced thinning of said graphene oxide gel; (c) partially or completely removing said fluid medium from the deposited graphene oxide gel to form a graphene oxide mass having an inter-plane spacing d 002 of 0.4 nm to 1.2 nm as determined by X-ray diffraction and an oxygen content no less than 20% by weight; and (d) heat treating the graphene oxide mass to form said unitary graphene material at a heat treatment temperature higher than 100° C. to an extent that an inter-plane spacing d 002 is decreased to a value of from 0.3354 nm to 0.4 nm and the oxygen content is decreased to less than 5% by weight.