Volume 96, Number 1, October 2011
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||15 September 2011|
Manipulation of heat current by the interface between graphene and white graphene
Department of Physics and Centre for Computational Science and Engineering, National University of Singapore - Singapore 117542, Republic of Singapore
Accepted: 17 August 2011
We investigate the heat current flowing across the interface between graphene and hexagonal boron nitride (the so-called white graphene) using both molecular dynamics simulation and nonequilibrium Green's function approaches. These two distinct methods discover the same phenomena that the heat current is reduced linearly with increasing number of carbon atom at the interface, and the zigzag interface causes stronger reduction of heat current than the armchair interface. These phenomena are interpreted by both the lattice dynamics analysis and the transmission function explanation, which both reveal that the localized phonon modes at interfaces are responsible for the heat management. The room temperature interface thermal resistance is about 7×10− 10 m2 K/W in zigzag interface and 3.5×10− 10 m2 K/W in armchair interface, which directly results in stronger heat reduction in the zigzag interface. Our theoretical results provide a specific route for experimentalists to control the heat transport in the graphene and hexagonal boron nitride compound through shaping the interface between these two materials.
PACS: 65.80.-g – Thermal properties of small particles, nanocrystals, nanotubes, and other related systems / 63.22.-m – Phonons or vibrational states in low-dimensional structures and nanoscale materials / 61.48.-c – Structure of fullerenes and related hollow and planar molecular structures
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.