When graphene is placed on an amorphous substrate like SiO2, thermal conductivity of graphene is strongly suppressed. In this work, the researchers measured how thermal conductivity depends on the number of graphene layers stacked on top of each other. They developed a theoretical model, and found that phonons in graphene hit the graphene-SiO2 interface, and interaction of phonons with interface is the major reason for thickness-dependent thermal conductivity of graphene samples. The result is relevant for the application of graphene for electronics, thermal management, and other applications.
TACC staff created the scientific illustration in Maya.
Mir Mohammad Sadeghia