Journal
NANO LETTERS
Volume 15, Issue 9, Pages 5667-5672Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00910
Keywords
Rhenium disulfide; ReS2; polarized Raman spectroscopy; STEM; anisotropic; transition metal dichalcogenide; 2-D material
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Funding
- Air Force Office of Scientific Research [FA9550-14-1-0268]
- Columbia University Presidential Fellowship
- Center for Functional Nanomaterials at Brookhaven National Laboratory
- National Science Foundation [DMR-112984]
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Rhenium disulfide (ReS2) is a semiconducting layered transition metal dichalcogenide that exhibits a stable distorted 1T phase. The reduced symmetry of this system leads to in-plane anisotropy in various material properties. Here, we demonstrate the strong anisotropy in the Raman scattering response for linearly polarized excitation. Polarized Raman scattering is shown to permit a determination of the crystallographic orientation of ReS2 through comparison with direct structural analysis by scanning transmission electron microscopy (STEM). Analysis of the frequency difference of appropriate Raman modes is also shown to provide a means of precisely determining layer thickness up to four layers.
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