Thermal conductivity of graphene mediated by strain and size

被引:91
作者
Kuang, Youdi [1 ,2 ,3 ]
Lindsay, Lucas [4 ]
Shi, Sanqiang [3 ,5 ]
Wang, Xinjiang [1 ]
Huang, Baoling
机构
[1] Jinan Univ, Coll Sci & Engn, Guangzhou, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
[5] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen, Peoples R China
基金
中国国家自然科学基金;
关键词
Phonon thermal transport; Graphene; First principles; Strain and size effects; SINGLE-LAYER GRAPHENE; TRANSPORT; GRAPHITE;
D O I
10.1016/j.ijheatmasstransfer.2016.05.072
中图分类号
O414.1 [热力学];
学科分类号
摘要
Based on first-principles calculations and full iterative solution of the linearized Boltzmann-Peierls transport equation for phonons, we systematically investigate effects of strain, size and temperature on the thermal conductivity k of suspended graphene. The calculated size-dependent and temperature dependent k for finite samples agree well with experimental data. The results show that, contrast to the convergent room-temperature k = 5450 W/m-K of unstrained graphene at a sample size similar to 8 cm, k of strained graphene diverges with increasing the sample size even at high temperature. Out-of-plane acoustic phonons are responsible for the significant size effect in unstrained and strained graphene due to their ultralong mean free path and acoustic phonons with wavelength smaller than 10 nm contribute 80% to the intrinsic room temperature k of unstrained graphene. Tensile strain hardens the flexural modes and increases their lifetimes, causing interesting dependence of k on sample size and strain due to the competition between boundary scattering and intrinsic phonon-phonon scattering. k of graphene can be tuned within a large range by strain for the size larger than 500 mu m. These findings shed light on the nature of thermal transport in two-dimensional materials and may guide predicting and engineering k of graphene by varying strain and size. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:772 / 778
页数:7
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