Length-dependent thermal conductivity in suspended single-layer graphene

Xiangfan Xu, Luiz F. C. Pereira, Yu Wang, Jing Wu, Kaiwen Zhang, Xiangming Zhao, Sukang Bae, Cong Tinh Bui, Rongguo Xie, John T. L. Thong, Byung Hee Hong, Kian Ping Loh, Davide Donadio (), Baowen Li () and Barbaros Özyilmaz ()
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Xiangfan Xu: National University of Singapore
Luiz F. C. Pereira: Max Planck Institute for Polymer Research
Yu Wang: State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Science
Jing Wu: National University of Singapore
Kaiwen Zhang: National University of Singapore
Xiangming Zhao: National University of Singapore
Sukang Bae: SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT), Sungkyunkwan University
Cong Tinh Bui: NUS Graduate School for Integrative Science and Engineering
Rongguo Xie: National University of Singapore
John T. L. Thong: NUS Graduate School for Integrative Science and Engineering
Byung Hee Hong: Seoul National University
Kian Ping Loh: Graphene Research Center, National University of Singapore
Davide Donadio: Max Planck Institute for Polymer Research
Baowen Li: National University of Singapore
Barbaros Özyilmaz: National University of Singapore

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Graphene exhibits extraordinary electronic and mechanical properties, and extremely high thermal conductivity. Being a very stable atomically thick membrane that can be suspended between two leads, graphene provides a perfect test platform for studying thermal conductivity in two-dimensional systems, which is of primary importance for phonon transport in low-dimensional materials. Here we report experimental measurements and non-equilibrium molecular dynamics simulations of thermal conduction in suspended single-layer graphene as a function of both temperature and sample length. Interestingly and in contrast to bulk materials, at 300 K, thermal conductivity keeps increasing and remains logarithmically divergent with sample length even for sample lengths much larger than the average phonon mean free path. This result is a consequence of the two-dimensional nature of phonons in graphene, and provides fundamental understanding of thermal transport in two-dimensional materials.

Date: 2014
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DOI: 10.1038/ncomms4689

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