Journal
CARBON
Volume 104, Issue -, Pages 203-213Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.03.043
Keywords
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Funding
- National Natural Science Foundation of China [11572140, 11302084, 11502217, U1232110, U1332105, 11204253, 11335006]
- Programs of Innovation and Entrepreneurship of Jiangsu Province
- Fundamental Research Funds for the Central Universities [JUSRP11529]
- Postdoctoral Science Foundation [2015M570854]
- Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (NUAA) [MCMS-0416G01]
- Open Fund of Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education (NUAA) [INMD-2015M01]
- Thousand Youth Talents Plan
- Specialized Research Fund for the Doctoral Program of Higher Education [20120121110021]
- National High-tech RAMP
- D Program of China (863 Program) [2014AA052202]
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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 (GNRk) is demonstrated using nonequilibrium molecular dynamics simulations. The results show that the thermal conductivity of GNR-k (around 5.1 W m(-1)K(-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. (C) 2016 Elsevier Ltd. All rights reserved.
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