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 E¹_2g and A_1g modes were found to be (1.32 and 1.23) × 10^–2 cm^–1/K, respectively. The thermal conductivity of the suspended FLMS at room temperature was estimated to be ∼52 W/mK.