Theoretical and Experimental Study of Phonon Spectra of Bulk and Nano-Sized MoS Layer Crystals.

Theoretical analysis of Raman scattering spectra (RS) for single-crystal MoS sample and atomically thin MoS sample consisting from one to few layers was performed in order to explain the change of MoS vibrations at transition from a monoatomic layer to a bulk crystal. Experiments have shown that changes of frequencies of the most intensive bands arising from the in-plane, [Formula: see text], and out-of-plane, A , vibrations, as a function of number n of layers looks differently. Thus, the frequency of ω(A ) is increasing with growth of n, whereas the frequency of [Formula: see text] is decreasing.