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Self-assembly of C60 monolayer on epitaxially grown, nanostructured graphene on Ru(0001) surface
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C60 molecules adsorbed on graphene/Ru(0001) substrate were investigated by scanning tunneling microscopy(STM) at 5 K. On high quality substrates, C60 molecules adopt a commensurate growth mode, leading to formation of a supramolecular structure with perfect periodicity and few defects. On under-annealed substrates with imperfections and domains, the molecules form the same closely packed hexagonal structures in spite of underlying corrugations, disorders or steps, indicating a weak molecule-substrate interaction—a conclusion that is also supported by DFT calculations. This system may be beneficial to the fabrication of carbon based devices and of other types of organic functional overlayers.
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