Thermal effects on the characteristic Raman spectrum of molybdenum disulfide (MoS2) of varying thicknesses
Sina NajmaeiRice University 1 Department of Mechanical Engineering and Materials Science, , Houston, Texas 77005, USAZ. LiuRice University 1 Department of Mechanical Engineering and Materials Science, , Houston, Texas 77005, USAPulickel M. AjayanRice University 1 Department of Mechanical Engineering and Materials Science, , Houston, Texas 77005, USAJun LouRice University 1 Department of Mechanical Engineering and Materials Science, , Houston, Texas 77005, USA
2012en
ABI
Annotatsiya
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 E2g1 and A1g 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.
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