Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS₂.

ABSTRACT: We investigated interlayer phonon modes of mechanically exfoliated few-layer 2H-SnS₂ samples by using room temperature low-frequency micro-Raman spectroscopy. Raman measurements were performed using laser wavelengths of 441.6, 514.4, 532 and 632.8 nm with power below 100 μW and inside a vacuum chamber to avoid photo-oxidation. The intralayer E_g and A_1g modes are observed at ~206 cm^-1 and 314 cm^-1, respectively, but the E_g mode is much weaker for all excitation energies. The A_1g mode exhibits strong resonant enhancement for the 532 nm (2.33 eV) laser. In the low-frequency region, interlayer vibrational modes of shear and breathing modes are observed. These modes show characteristic dependence on the number of layer

SUBMITTER: Sriv T 

PROVIDER: S-EPMC6033902 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature