Functionalization mediates heat transport in graphene nanoflakes
Journal article, 2016
The high thermal conductivity of graphene and few-layer graphene undergoes severe degradations through contact with the substrate. Here we show experimentally that the thermal management of a micro heater is substantially improved by introducing alternative heat-escaping channels into a graphene-based film bonded to functionalized graphene oxide through amino-silane molecules. Using a resistance temperature probe for in situ monitoring we demonstrate that the hotspot temperature was lowered by similar to 28 degrees C for a chip operating at 1,300 Wcm(-2). Thermal resistance probed by pulsed photothermal reflectance measurements demonstrated an improved thermal coupling due to functionalization on the graphene-graphene oxide interface. Three functionalization molecules manifest distinct interfacial thermal transport behaviour, corroborating our atomistic calculations in unveiling the role of molecular chain length and functional groups. Molecular dynamics simulations reveal that the functionalization constrains the cross-plane phonon scattering, which in turn enhances in-plane heat conduction of the bonded graphene film by recovering the long flexural phonon lifetime.
contacts
oxide
paper
molecular-dynamics
conductance
spreader
management
hot-spots
few-layer graphene
thermal-conductivity
Author
H. X. Han
Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion
Yong Zhang
Electronics Material and Systems
Nan Wang
Electronics Material and Systems
Majid Kabiri Samani
Electronics Material and Systems
Y. X. Ni
University of Minnesota Twin Cities
Z. Y. Mijbil
Lancaster University
Al-Qasim Green University
Michael Edwards
Electronics Material and Systems
S. Y. Xiong
Max Planck Institute for Polymer Research
K. Saaskilahti
Aalto University
Murali Murugesan
Electronics Material and Systems
Yifeng Fu
Electronics Material and Systems
L. Ye
SHT Smart High Tech AB
H. Sadeghi
Lancaster University
S. Bailey
Lancaster University
Y. A. Kosevich
Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion
N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences
C. J. Lambert
Lancaster University
Johan Liu
Electronics Material and Systems
S. Volz
Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion
Nature Communications
2041-1723 (ISSN)
Vol. 7 11281Innovative Nano and Micro Technologies for Advanced Thermo and Mechanical Interfaces (NANOTHERM)
European Commission (FP7) (EC/FP7/318117), 2012-09-01 -- 2015-08-31.
Subject Categories (SSIF 2011)
Inorganic Chemistry
Physical Chemistry
Condensed Matter Physics
DOI
10.1038/ncomms11281
PubMed
27125636