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Atomic Structures of Pt Nanoclusters Supported on Graphene Grown on Pt(111)

Atomic structures of Pt nanoclusters on graphene/Pt(111) were investigated with various techniques to probe the surface under ultrahigh-vacuum conditions and with calculations based on density-functional theory. Monolayer graphene was grown on thermal decomposition of ethylene on Pt(111) at 950 K and Pt clusters on the deposition of Pt vapor onto graphene/Pt(111) at 300 K. The graphene had two predominant domains: one had a small angle of rotation between the graphene and the underlying Pt lattice, structurally commensurate with the Pt(111) lattice (G0°), and the other was rotated about 30° with respect to the Pt lattice (G30°). G0° had a slightly corrugated structure, involving tetrahedral hybridization, and a stronger adsorption on Pt(111); in contrast, G30° was flat and weakly bound to Pt(111) via a van der Waals interaction. The grown Pt clusters were structurally ordered, having a face-centered cubic phase and growing in a (111) orientation, whereas they had correspondingly disparate nucleation modes...