thermal ultralow and strain robustness - nsfc.gov.cn

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Research Results

42    Vol.24,No.3,2016  SCIENCE FOUNDATION IN CHINA

Thermal conductivityof graphene kirigami:Ultralow and strain robustness

With the support by the National Natural Science Foundation of China,the research team led by Prof.Wei Ning(魏宁)and Prof.Zhao Junhua(赵军华)at the Northwest A&F University and Jiangnan Uni-versity,respectively,explored the thermal dissipation properties of tailored graphene nanoribbon,whichwas published in Carbon(2016,104:203—213).Kirigami structure,from the macro-to the nanoscale,exhibits distinct and tunable properties from orig-

inal two-dimensional sheet by tailoring.Here,they report an extremely low thermal conductivity of gra-phene with kirigami structure,which is about two orders lower than that of pristine graphene ribbon.The micro-heat flux on each atom of graphene nanoribbon kirigami(GNR-k)shows the reduction of the

thermal conductivity from three main sources:the elongation of real heat flux path,the overestimation ofreal heat flux area and the phonon scattering at the vacancy of the edge.In particular,the strain engineer-ing effect on the thermal conductivity of GNR-k and a thermal robustness property has been investigated.Their results provide physical insights into the origins of the ultralow and strain robust thermal conduc-

tivity of GNR-k,which also suggests that the GNR-k can be used for nanoscale heat management and ther-moelectric application.

Figure (a)The micro-heat flux on each atom of GNR-k.The thermal conductivity as a function of the vacancy size(b)and engineer strain(c).

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