Anomalous Lattice Vibrations of Single and Few-Layer MoS2

Details Anomalous Lattice Vibrations of Single and Few-Layer MoS2 Anomalous Lattice Vibrations of Single and Few-Layer MoS2

2010-05-14

arxiv.org/abs/1005.2509v1

ACS Nano 4, 2695 (2010)

Physics

Condensed Matter

Materials Science

14 pages, 4 figures

Scientific paper

10.1021/nn1003937

Molybdenum disulfide (MoS2) of single and few-layer thickness was exfoliated on SiO2/Si substrate and characterized by Raman spectroscopy. The number of S-Mo-S layers of the samples was independently determined by contact-mode atomic-force microscopy. Two Raman modes, E12g and A1g, exhibited sensitive thickness dependence, with the frequency of the former decreasing and that of the latter increasing with thickness. The results provide a convenient and reliable means for determining layer thickness with atomic-level precision. The opposite direction of the frequency shifts, which cannot be explained solely by van der Waals interlayer coupling, is attributed to Coulombic interactions and possible stacking-induced changes of the intralayer bonding. This work exemplifies the evolution of structural parameters in layered materials in changing from the 3-dimensional to the 2-dimensional regime.

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