Two-dimensional phonon transport in supported graphene

Jae Hun Seol (1) , Insun Jo (1) , Arden L. Moore (1) , Lucas Lindsay (2, 3) , Zachary H. Aitken (1) , Michael T. Pettes (1) , Xuesong Li (1) , Zhen Yao (1) , Rui Huang (1) , David Broido (2) , Natalio Mingo (4) , Rodney S. Ruoff (1) , Li Shi (1)

1 University of Texas at Austin [Austin]
2 BC - Boston College
3 Christopher Newport University
4 LITEN - Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux

The reported thermal conductivity (κ) of suspended graphene, 3000 to 5000 watts per meter per kelvin, exceeds that of diamond and graphite. Thus, graphene can be useful in solving heat dissipation problems such as those in nanoelectronics. However, contact with a substrate could affect the thermal transport properties of graphene. Here, we show experimentally that κ of monolayer graphene exfoliated on a silicon dioxide support is still as high as about 600 watts per meter per kelvin near room temperature, exceeding those of metals such as copper. It is lower than that of suspended graphene because of phonons leaking across the graphene-support interface and strong interface-scattering of flexural modes, which make a large contribution to κ in suspended graphene according to a theoretical calculation.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Jae Hun Seol, Insun Jo, Arden L. Moore, Lucas Lindsay, Zachary H. Aitken, et al.. Two-dimensional phonon transport in supported graphene. Science, 2010, 328 (5975), pp.213-216. ⟨10.1126/science.1184014⟩. ⟨cea-00818281⟩