Tuning Interfacial Thermal Conductance of Graphene Embedded in Soft Materials by Vacancy Defects

Liu, Ying; Hu, Chongze; Huang, Jingsong; Sumpter, Bobby G.; Qiao, Rui

doi:10.1063/1.4922775

Title: Tuning Interfacial Thermal Conductance of Graphene Embedded in Soft Materials by Vacancy Defects

Journal Article · Tue Jun 23 00:00:00 EDT 2015 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4922775· OSTI ID:1187920

Liu, Ying ^[1]; Hu, Chongze ^[1]; Huang, Jingsong ^[2]; Sumpter, Bobby G. ^[2]; Qiao, Rui ^[3]

Clemson Univ., SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Nanocomposites based on graphene dispersed in matrices of soft materials are promising thermal management materials. Their effective thermal conductivity depends on both the thermal conductivity of graphene and the conductance of the thermal transport across graphene-matrix interfaces. Here we report on molecular dynamics simulations of the thermal transport across the interfaces between defected graphene and soft materials in two different modes: in the across mode, heat enters graphene from one side of its basal plane and leaves through the other side; in the non-across mode, heat enters or leaves a graphene simultaneously from both sides of its basal plane. We show that, as the density of vacancy defects in graphene increases from 0 to 8%, the conductance of the interfacial thermal transport in the across mode increases from 160.4 16 to 207.8 11 MW/m2K, while that in the non-across mode increases from 7.2 0.1 to 17.8 0.6 MW/m2K. The molecular mechanisms for these variations of thermal conductance are clarified by using the phonon density of states and structural characteristics of defected graphenes. On the basis of these results and effective medium theory, we show that it is possible to enhance the effective thermal conductivity of thermal nanocomposites by tuning the density of vacancy defects in graphene despite the fact that graphene s thermal conductivity always decreases as vacancy defects are introduced.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1187920

Journal Information:: Journal of Chemical Physics, Vol. 142, Issue 24; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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