Thermal conductivity of graphene kirigami: Ultralow and strain robustness

Thermal conductivity of graphene kirigami: Ultralow and strain robustness Kirigami structure, from the macro- to the nanoscale, exhibits distinct and tunable properties from original two-dimensional sheet by tailoring the original two-dimensional sheet. In the present work, the extreme reduction of the thermal conductivity by tailoring sizes in graphene nanoribbon kirigami (GNR-k) is demonstrated using nonequilibrium molecular dynamics simulations. The results show that the thermal conductivity of GNR-k (around 5.1 W m−1K−1) is around two orders of magnitude lower than that of the pristine graphene nanoribbon (GNR) (around 151.6 W m−1K−1), while the minimum value is expected to be up to zero in extreme case from our theoretical model. The further study of the micro-heat flux on each atom of GNR-k shows the reduction of the thermal conductivity from three main sources: the elongation of real heat flux path, the overestimation of real heat flux area and the phonon scattering at the vacancy of the edge. In particular, the strain engineering effect on the thermal conductivity of GNR-k and a thermal robustness property has been investigated. Our results provide physical insights into the origins of the ultralow and robust thermal conductivity of GNR-k, which also suggests that the GNR-k can be used for nanoscale heat management and thermoelectric application. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Carbon Elsevier

Thermal conductivity of graphene kirigami: Ultralow and strain robustness

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0008-6223
D.O.I.
10.1016/j.carbon.2016.03.043
Publisher site
See Article on Publisher Site

Abstract

Kirigami structure, from the macro- to the nanoscale, exhibits distinct and tunable properties from original two-dimensional sheet by tailoring the original two-dimensional sheet. In the present work, the extreme reduction of the thermal conductivity by tailoring sizes in graphene nanoribbon kirigami (GNR-k) is demonstrated using nonequilibrium molecular dynamics simulations. The results show that the thermal conductivity of GNR-k (around 5.1 W m−1K−1) is around two orders of magnitude lower than that of the pristine graphene nanoribbon (GNR) (around 151.6 W m−1K−1), while the minimum value is expected to be up to zero in extreme case from our theoretical model. The further study of the micro-heat flux on each atom of GNR-k shows the reduction of the thermal conductivity from three main sources: the elongation of real heat flux path, the overestimation of real heat flux area and the phonon scattering at the vacancy of the edge. In particular, the strain engineering effect on the thermal conductivity of GNR-k and a thermal robustness property has been investigated. Our results provide physical insights into the origins of the ultralow and robust thermal conductivity of GNR-k, which also suggests that the GNR-k can be used for nanoscale heat management and thermoelectric application.

Journal

CarbonElsevier

Published: Aug 1, 2016

References

  • Mechanical and thermal transport properties of graphene with defects
    Hao, F.; Fang, D.; Xu, Z.
  • A molecular dynamics study of the thermal conductivity of graphene nanoribbons containing dispersed Stone–Thrower–Wales defects
    Ng, T.Y.; Yeo, J.J.; Liu, Z.S.
  • Thermal transport properties of graphene nanomeshes
    Hu, L.; Maroudas, D.
  • Graphene kirigami
    Blees, M.K.; Barnard, A.W.; Rose, P.A.; Roberts, S.P.; McGill, K.L.; Huang, P.Y.
  • Extremely compliant and highly stretchable patterned graphene
    Zhu, S.; Huang, Y.; Li, T.
  • Networked nanoconstrictions: An effective route to tuning the thermal transport properties of graphene
    Cao, B.-Y.; Yao, W.-J.; Ye, Z.-Q.

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