Freitag et al argue in their recent paper that umklapp scattering sets in at T>350K in graphene, thereby reducing the thermal conductivity from 5000 W/m-K to 850 W/m-K at T=800K. This measurement was made on a micron-wide (and long) graphene flake using spatially resolved Raman. The peak temperature in the graphene ribbon was found to be 1050K while the peak energy dissipation was found to be 210 kW/cm2.
Reference: Marcus Freitag*, Mathias Steiner, Yves Martin, Vasili Perebeinos, Zhihong Chen, James C. Tsang and Phaedon Avouris, “Energy Dissipation in Graphene Field-Effect Transistors,” Nano Letters, Advance Publication, 30 March 2009.
#1 by AndrewBoldman at June 4th, 2009
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