Thermal properties of molybdenum disulfide (MoS2) have recently attracted attention related to fundamentals
of heat propagation in strongly anisotropic materials, and in the context of potential applications to optoelectronics and thermoelectrics. Multiple empirical potentials have been developed for classical molecular dynamics
(MD) simulations of this material, but it has been unclear which provides the most realistic results. Here, we
calculate lattice thermal conductivity of single- and multilayer pristine MoS2 by employing three different
thermal transport MD methods: equilibrium, nonequilibrium, and homogeneous nonequilibrium ones. We mainly
use the Graphics Processing Units Molecular Dynamics code for numerical calculations, and the Large-scale
Atomic/Molecular Massively Parallel Simulator code for crosschecks. Using different methods and computer
codes allows us to verify the consistency of our results and facilitate comparisons with previous studies, where
different schemes have been adopted. Our results using variants of the Stillinger-Weber potential are at odds
with some previous ones and we analyze the possible origins of the discrepancies in detail. We show that, among
the potentials considered here, the reactive empirical bond order (REBO) potential gives the most reasonable
predictions of thermal transport properties as compared to experimental data. With the REBO potential, we
further find that isotope scattering has only a small effect on thermal conduction in MoS2 and the in-plane thermal
conductivity decreases with increasing layer number and saturates beyond about three layers. We identify the
REBO potential as a transferable empirical potential for MD simulations of MoS2 which can be used to study
thermal transport properties in more complicated situations such as in systems containing defects or engineered
nanoscale features. This work establishes a firm foundation for understanding heat transport properties of MoS2
using MD simulations
