Wednesday, August 03, 2011

US Patent 7988941 - Preparing graphene sheets

This patent from Samsung teaches a step forward in the large scale production of graphene films for applications as transparent electrodes and in flexible solar cells. Claim 1 reads:

1. A method of preparing a graphene sheet, the method comprising:

depositing a film consisting of a graphitizing catalyst;

wherein a width of the film is one millimeter or greater;

heat-treating a gaseous carbon source in the presence of the graphitizing catalyst to form graphene, while maintaining the shape of the film; and

cooling the graphene to form a graphene sheet, wherein a width and a length of the graphene sheet are each about 1 millimeter or greater.