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Thermal effects on the characteristic Raman spectrum of molybdenum disulfide (MoS2) of varying thicknesses
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Optical images of mechanically exfoliated MoS2 flakes on SiO2 substrate. (a) The single- and few- layered samples, marked by SL and FL respectively, (b) Multi-layered MoS2 regions, in which the number of layers increases in the direction indicated by the arrow. (c) SEM image of a chemically exfoliated, suspended, few-layer MoS2 flake on a TEM grid. (d) and (e) AFM images of MoS2 flakes on SiO2 substrate. Insets show the MoS2 with a thickness of ∼0.7 nm, 1.5 nm in (d) and 3.5 nm, 6.5 nm in (e). (f) TEM image of a three-layer liquid exfoliated MoS2 flake. The layer distance is ∼0.7 nm. (g) Atomic HRTEM of a few-layer MoS2 flake. The hexagonal lattice structure of the MoS2 film is clearly observed. (h) HRTEM of a single-layer MoS2 on thin-carbon film. Inset: corresponding reduced FFT image shows the typical diffraction patterns of single-layer MoS2.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Raman spectra of bulk MoS2 and a single-layer MoS2 flake on SiO2 substrate. Inset: illustration of the three Raman Active modes: , , and . Molybdenum atoms are in black and yellow represents sulfurs. The blue arrays indicate the orientation of the vibrations. (b) Illustrating the characteristic red shift observed in the Raman spectra of single-layered MoS2 at varying laser powers. (c) The change in peak positions of MoS2 samples of different thicknesses represented by the difference in the peak position for and modes as the laser power is increased from 2mW to 20 mW.

Image of FIG. 3.
FIG. 3.

(Color online) The change in Raman peak line-width as a result of change in laser power and its thickness dependency (a) for and (b) modes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal effects on the characteristic Raman spectrum of molybdenum disulfide (MoS2) of varying thicknesses