Compression processes for graphene sheets

摘要

Processes for preparing or handling graphene sheets wherein low bulk density graphene sheets are compressed. The graphene sheets may be produced by a thermal treatment such as exfoliation of precursor or reduction or annealing of previously existing graphene sheets and conveyed in a closed system to a compression apparatus.

主权项

1. A process for preparing graphene sheets having a surface area of at least about 100 m2/g and a carbon to oxygen molar ratio of between about 3:2 to about 1000:1, comprising the steps of thermally exfoliating graphite oxide to produce graphene sheets by heating the graphite oxide to a temperature of at least about 600° C. at a rate of at least about 120° C./min, conveying the graphene sheets in a closed system to a compression apparatus, and compressing the graphene sheets with a pressure of about 5 to about 1000 psi.