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      Two-dimensional phonon transport in supported graphene.

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          Abstract

          The reported thermal conductivity (kappa) 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 kappa 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 kappa in suspended graphene according to a theoretical calculation.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          Apr 09 2010
          : 328
          : 5975
          Affiliations
          [1 ] Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
          Article
          328/5975/213
          10.1126/science.1184014
          20378814
          32d93529-fe14-42bd-828f-4b220bdb297d
          History

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