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van der Waals Graphene Kirigami Heterostructure for Strain-Controlled Thermal Transparency
journal contribution
posted on 2018-11-14, 17:48 authored by Yuan Gao, Baoxing XuProgramming thermal transport across
interfaces by engineering
strain is of critical importance for exploring mechanical controllable
and thermal manageable devices with multifunctionalities. Here, we
report a van der Waals heterostructure that is composed of bilayer
graphene kirigami with diverse layer cut patterns and assembly organizations
and show that the thermal flow intensity across the van der Waals
interfaces, named as thermal transparency, could be continuously regulated
by applying an external in-plane tensile strain. The density of atomic
interactions across the interfaces and the distribution of delocalized
phonon modes in each graphene kirigami are elucidated to understand
the underlying thermal transport mechanism and are also incorporated
into a theoretical model for quantitative predictions of thermal conductance
under mechanical strain. A proof-of-conceptual van der Waals graphene
kirigami heterostructure by design is proposed and validated through
extensive full-scale atomistic simulations on the feasibility and
reliability of regulating the transparency ratio of thermal transport
by mechanical strain, demonstrating its potential applications in
thermal and electronic devices.
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van der Waals Graphene Kirigami Heterostructureatomistic simulationsengineering straindelocalized phonon modesflow intensitytransparency ratiodevicebilayer graphene kirigamiassembly organizationsproof-of-conceptual van der Waals graphene kirigami heterostructuretransport mechanismgraphene kirigamiTransparency Programmingvan der Waals interfacesvan der Waals heterostructure
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