Molybdenum Disulfide Nanoflakes Grown by Chemical Vapor Deposition on Graphite: Nucleation, Orientation, and Charge Transfer

Morbec, Juliana M.

doi:10.1021/acs.jpcc.9b10120

Molybdenum Disulfide Nanoflakes Grown by Chemical Vapor Deposition on Graphite: Nucleation, Orientation, and Charge Transfer

Morbec, Juliana M.

Authors

Juliana Maria Abreu Da Silva Morbec j.morbec@keele.ac.uk

Abstract

Two-dimensional molybdenum disulfide on graphene grown by chemical vapor deposition is a promising van der Waals system for applications in optoelectronics and catalysis. To extend the fundamental understanding of growth and intrinsic properties of molybdenum disulfide on graphene, molybdenum disulfide on highly oriented pyrolytic graphite is a suitable model system. Here, we show experimentally and by density functional theory calculations that molybdenum disulfide flakes grow in two orientations. One of the orientations is energetically preferred, the other one is rotated by 30°, but both orientations are found to be stable at room temperature. Combined Kelvin probe microscopy and Raman spectroscopy measurements show that the flakes with a typical size of a few hundred nanometers are electron doped in the order of 1012/cm2, while the doping of a molybdenum disulfide single layer exfoliated on silicon dioxide is on the order of 1013/cm2.

Journal Article Type	Addendum
Acceptance Date	Dec 21, 2020
Publication Date	Jan 3, 2020
Journal	The Journal of Physical Chemistry C
Print ISSN	1932-7447
Publisher	American Chemical Society
Volume	124
Issue	4
Pages	2689-2697
DOI	https://doi.org/10.1021/acs.jpcc.9b10120
Keywords	Molybdenum Disulfide Nanoflakes, Chemical Vaopr Deposition, Graphite, Nucleation, Orientation, Charge Transfer.
Publisher URL	https://pubs.acs.org/doi/10.1021/acs.jpcc.9b10120