Thermal Transport across Solid Interfaces with Nanoscale Imperfections: Effects of Roughness, Disorder, Dislocations, and Bonding on Thermal Boundary Conductance

Figure 10

Thermal boundary conductance across our Al/SLG (filled triangles) and Al/O-SLG (unfilled triangles) interfaces [24]. The thermal transport across the Al/SLG interface increases by a factor of two with oxygen functionalization of the graphene. Our measured values are in good agreement with conductances measured across Al/diamond and Al/O-diamond interfaces, which exhibit an increase in thermal boundary conductance with oxygen termination [145, 149]. We model the thermal conductance across the Al/SLG interface with the DMM, as shown by the solid line. We adjust the velocity of the SLG in our DMM calculations to model the Al/O-SLG thermal boundary conductance (dashed line), and find that the resultant velocity in the oxygenated SLG is about a factor of two higher than the non-functionalized sample. This is indicative of the increase in bond strength between the Al and the SLG via the oxygen adsorbates.