  Heat dissipation is a very critical problem for designing nano-functional
devices, including MoS2/Graphene heterojunctions. In this paper we investigate
thermal transport in MoS2/Graphene hybrid nanosheets under various heating
conditions, by using molecular dynamics simulation. Diverse transport processes
and characteristics, depending on the conducting layers, are found in these
structures. The thermal conductivities can be tuned by interlayer coupling,
environment temperature and interlayer overlap. The highest thermal
conductivity at room temperature is achieved as more than 5 times of that of
single layer MoS2 when both layers are heated and 100% overlapped. Different
transport mechanisms in the hybrid nanosheets are explained by phonon density
of states, temperature distribution, and ITR. Our results not only could
provide clues to master the heat transport in functional devices based on
MoS2/Graphene heterojunctions, but also are useful to analyze thermal transport
in other van der Waals hybrid nanosheets.
