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The photoluminescence (PL) origin of bright blue emission arising from intrinsic states in graphene quantum dots (GQDs) is investigated. The bright PL of intercalatively acquired GQDs is attributed to favorably formed subdomains composed of four to seven carbon hexagons. Random and harsh oxidation which hinders the energetically favorable formation of subdomains causes weak and redshifted PL.
We report the reversible oxidation and reduction of single layer graphene on a self-aligned Cu-rich CuO x layer, which was created on a Cu substrate by thermal reduction of a native Cu-oxide layer while forming graphene on top of the Cu by chemical vapor deposition. The reversible oxidation states of graphene, revealed by X-ray photoemission and Raman spectroscopies, were driven by migration...
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