Thermal effects on the characteristic Raman spectrum of molybdenum disulfide (MoS 2 ) of varying thicknesses

In this letter, thermal effects on the Raman spectra of molybdenum disulfide with thicknesses ranging from bulk to monolayer were evaluated. We quantitatively determined the laser-induced heating effects on the peak position and the line-width of the Raman spectrum. We found considerable thickness-d...

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Bibliographic Details
Published in:Applied physics letters 2012-01, Vol.100 (1), p.013106-013106-4
Main Authors: Najmaei, S., Liu, Z., Ajayan, P. M., Lou, J.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL LATTICES
HEAT TREATMENTS
LASER RADIATION
LINE WIDTHS
MATERIALS SCIENCE
MOLYBDENUM SULFIDES
PHONONS
POTENTIAL ENERGY
RAMAN SPECTRA
RED SHIFT
TEMPERATURE DEPENDENCE
THICKNESS
VIBRATIONAL STATES
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Summary:In this letter, thermal effects on the Raman spectra of molybdenum disulfide with thicknesses ranging from bulk to monolayer were evaluated. We quantitatively determined the laser-induced heating effects on the peak position and the line-width of the Raman spectrum. We found considerable thickness-dependent red-shifts as well as line-width changes for both E 2 g 1 and A 1 g vibrating modes as laser power was increased. Our results enrich the knowledge of phononic behaviors of this material and demonstrate the important effects of the anharmonic terms in the lattice potential energy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3673907