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Thermal conductance at the graphene-SiO2 interface measured by optical pump-probe spectroscopy

We have examined the interfacial thermal conductance σint of single and multi-layer graphene samples prepared on fused SiO2 substrates by mechanical exfoliation of graphite. By using an ultrafast optical pump pulse and monitoring the transient reflectivity on the picosecond time scale, we obtained an average σint of 5,000 W/cm2K for the graphene-SiO2 system. We observed significant variation in σint between individual samples, but found no systematic dependence on the thickness of the graphene layers.