Thermal Ultralow and strain robustness - nsfc.gov.cn

1
ResearchResults 42 Vol.24 No.3 2016 SCIENCEFOUNDATION INCHINA Thermal conductivit of ra hene kiri ami Ultralowand strain robustness With the support by theNationalNatural ScienceFoundationofChina the research teamledbyProf. WeiNing κÄþ andProf.Zhao Junhua 헔뻼뮪at theNorthwestA&F Universityand Jiangnan Uni versity respectively explored the thermal dissipationpropertiesof tailoredgraphenenanoribbon which was published inCarbon 2016 104 203 213 Kirigami structure fromthemacro to the nanoscale exhibits distinct and tunable properties fromorig inal two dimensional sheet by tailoring.Here they report anextremely lowthermal conductivityof gra phenewithkirigami structure which is about twoorders lower than that of pristine graphene ribbon. Themicro heat fluxon each atomof graphene nanoribbonkirigami GNR shows the reduction of the thermal conductivity fromthreemain sources the elongationof real heat fluxpath the overestimationof real heat flux area and the phonon scattering at the vacancy of the edge.Inparticular the strain engineer ing effect on the thermal conductivityofGNR and thermal robustness propertyhas been investigated. Their results provide physical insights into the origins of the ultralowand strain robust thermal conduc tivityofGNR which also suggests that theGNR can be used for nanoscale heatmanagement and ther moelectric application. Figure Themicro heat flux on each atomofGNR k.The thermal conductivity as function of the vacancy size andengineer strain

Transcript of Thermal Ultralow and strain robustness - nsfc.gov.cn

Page 1: Thermal Ultralow and strain robustness - nsfc.gov.cn

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).