Length-dependent thermal conductivity in suspended single-layer graphene

By Xiangfan Xu, Luiz Felipe Cavalcanti Pereira, Yu Wang, Jing Wu, Kaiwen Zhang, Xiang-Fu Zhao, S. Bae, Cong Tinh Bui, R. Xie, J. Thong and 5 more. Nature Communications, 2014

871 citations recorded by the source corpus.

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. Graphene is known to display unique functional properties due to its two-dimensional structure. Here, the authors measure the thermal conductivity of suspended graphene as a function of sample length, finding that thermal conductivity is higher in longer samples as a result of two-dimensional phonons.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/039ea97a55ee1a9275a2d78126b8e47d76071fbb

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Citations in the corpus

Two-Dimensional Materials for Thermal Management Applications (2018, background): “This trend has been confirmed by a suspended-pad measurement, showing that the thermal conductivity keeps logarithmically increasing even if the sample length reaches 10 mm, much longer than the mean free path.(53)”
Graphene Thermal Properties: Applications in Thermal Management and Energy Storage (2014, background): “[98] reported on the logarithmically divergent room temperature thermal conductivity in suspended graphene flakes with L ~ 0.”
Production and processing of graphene and related materials (2020, background): “Heat transfer properties of graphene have been a topic of high interest [1273-1276] based on calculations and measurements of its thermal conductivity in the range of a few thousands W/mK, i.”
Colloquium: Phononic thermal properties of two-dimensional materials (2017, methodology): “…2014), as well as from calculations including the nonequilibrium molecular dynamics (NEMD) simulations (Park, Lee, and Kim, 2013; Mu et al., 2014; Xu et al., 2014; Barbarino, Melis, and Colombo, 2015) and PBTE calculations (Fugallo et al., 2014; Lindsay et al., 2014; Gu and Yang, 2015; Majee and…”
Effect of Functionalization on Thermal Conductivities of Graphene/Epoxy Composites (2016, background): “[7] The TC of suspended graphene sheet depends on its length [24] due to the long phonon mean free path.”