Single crystalline graphene sheet and process of preparing the same

A method for preparing a single-crystal graphene sheet, the method comprising:

• forming a catalyst layer, the catalyst layer comprising a single-crystal graphitizing metal catalyst sheet;
• disposing a carbonaceous material on the catalyst layer;
• and
• heat-treating the catalyst layer and the carbonaceous material in at least one of an inert atmosphere and a reducing atmosphere to form a single-crystal graphene sheet.

A method for preparing a single-crystal graphene sheet, comprising:

• forming a catalyst layer, the catalyst layer comprising a single-crystal graphitizing metal catalyst sheet;
• disposing a self-assembling polymer on the catalyst layer;
• heat-treating the catalyst layer and the self-assembling polymer in at least one of an inert atmosphere and a reducing atmosphere to solid-solubilize a carbonaceous material in the catalyst layer;
• and
• heat-treating at a temperature and for a time sufficient to precipitate the solid-solubilized carbonaceous material and form a single-crystal graphene sheet.