Thermal conductivity of graphene mediated by strain and size
Abstract
Based on firstprinciples 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 sizedependent and temperaturedependent k for finite samples agree well with experimental data. The results show that, contrast to the convergent roomtemperature k = 5450 W/mK of unstrained graphene at a sample size ~8 cm, k of strained graphene diverges with increasing the sample size even at high temperature. Outofplane 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 μm. These findings shed light on the nature of thermal transport in twodimensional materials and may guide predicting and engineering k of graphene by varying strainmore »
 Authors:

 Jinan Univ., Guanzhou (China); The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
 The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong); Hong Kong Polytechnic Univ. Shenzhen Research Institute, Shenzhen (China)
 Jinan Univ., Guanzhou (China)
 The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Publication Date:
 Research Org.:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC22)
 OSTI Identifier:
 1256801
 Alternate Identifier(s):
 OSTI ID: 1328541
 Grant/Contract Number:
 AC0500OR22725; AC0205CH11231
 Resource Type:
 Accepted Manuscript
 Journal Name:
 International Journal of Heat and Mass Transfer
 Additional Journal Information:
 Journal Volume: 101; Journal ID: ISSN 00179310
 Publisher:
 Elsevier
 Country of Publication:
 United States
 Language:
 English
 Subject:
 77 NANOSCIENCE AND NANOTECHNOLOGY; phonon thermal transport; graphene; first principles; strain and size effects
Citation Formats
Kuang, Youdi, Shi, Sanqiang, Wang, Xinjiang, Huang, Baoling, and Lindsay, Lucas. Thermal conductivity of graphene mediated by strain and size. United States: N. p., 2016.
Web. doi:10.1016/j.ijheatmasstransfer.2016.05.072.
Kuang, Youdi, Shi, Sanqiang, Wang, Xinjiang, Huang, Baoling, & Lindsay, Lucas. Thermal conductivity of graphene mediated by strain and size. United States. doi:10.1016/j.ijheatmasstransfer.2016.05.072.
Kuang, Youdi, Shi, Sanqiang, Wang, Xinjiang, Huang, Baoling, and Lindsay, Lucas. Thu .
"Thermal conductivity of graphene mediated by strain and size". United States. doi:10.1016/j.ijheatmasstransfer.2016.05.072. https://www.osti.gov/servlets/purl/1256801.
@article{osti_1256801,
title = {Thermal conductivity of graphene mediated by strain and size},
author = {Kuang, Youdi and Shi, Sanqiang and Wang, Xinjiang and Huang, Baoling and Lindsay, Lucas},
abstractNote = {Based on firstprinciples 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 sizedependent and temperaturedependent k for finite samples agree well with experimental data. The results show that, contrast to the convergent roomtemperature k = 5450 W/mK of unstrained graphene at a sample size ~8 cm, k of strained graphene diverges with increasing the sample size even at high temperature. Outofplane 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 μm. These findings shed light on the nature of thermal transport in twodimensional materials and may guide predicting and engineering k of graphene by varying strain and size.},
doi = {10.1016/j.ijheatmasstransfer.2016.05.072},
journal = {International Journal of Heat and Mass Transfer},
number = ,
volume = 101,
place = {United States},
year = {2016},
month = {6}
}
Web of Science