Temperature-Dependent Raman Studies and Thermal Conductivity of Few-Layer MoS2

We report on the temperature dependence of in-plane E-2g and out-of-plane A(1g) Raman modes in high quality few layer MoS2 (FLMS) prepared using a high temperature vapor-phase method. The materials obtained were investigated using transmission electron microscopy. The frequencies of these two phonon modes were found to vary linearly with temperature. The first-order temperature coefficients for E-2g(1) and A(1g) modes were found to be (1.32 and 123) X 10(-2) cm(-1)/K, respectively. The thermal conductivity of the suspended FLMS at room temperature was estimated to be similar to 52 W/mK.