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Two-dimensional molybdenum disulphide on graphene grown by chemical vapourdeposition is a promising van der Waals system for applications inoptoelectronics and catalysis. To extend the fundamental understanding ofgrowth and intrinsic properties of molybdenum disulphide on graphene,molybdenum disulphide on highly oriented pyrolytic graphite is a suitable modelsystem. Here we show, experimentally and by density-functional-theorycalculations, that molybdenum disulphide flakes grow in two orientations. Oneof the orientations is energetically preferred, the other one is rotated by 30degree. Because of a high energy barrier confirmed by our calculations bothorientations are stable at room temperature and their switching can only beforced by external stimuli, i.e. by a scanning tunneling microscope tip.Combined Kelvin probe microscopy and Raman spectroscopy measurements show thatthe flakes with a typical size of a few hundred nanometers are less doped thanthe often studied exfoliated molybdenum disulphide single layer.

Molybdenum Disulphide Nanoflakes Grown by Chemical Vapour Deposition on Graphite: Nucleation, Orientation, and Charge Transfer