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.

molecular-dynamics

few-layer graphene

contacts

thermal-conductivity

management

oxide

conductance

spreader

paper

hot-spots

Author

H. X. Han

Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion

Yong Zhang

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Nan Wang

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Majid Kabiri Samani

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Y. X. Ni

University of Minnesota

Z. Y. Mijbil

Lancaster University

Al-Qasim Green University

Michael Edwards

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

S. Y. Xiong

Max Planck Institute

K. Saaskilahti

Aalto University

Murali Murugesan

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Yifeng Fu

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

L. Ye

SHT Smart High-Tech

H. Sadeghi

Lancaster University

S. Bailey

Lancaster University

Y. A. Kosevich

Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion

Russian Academy of Sciences

C. J. Lambert

Lancaster University

Johan Liu

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

S. Volz

Laboratoire d'Energetique Moleculaire et Macroscopique, Combustion

Nature Communications

2041-1723 (ISSN)

Vol. 7 11281

Innovative Nano and Micro Technologies for Advanced Thermo and Mechanical Interfaces (NANOTHERM)

European Commission (FP7), 2012-09-01 -- 2015-08-31.

Subject Categories

Inorganic Chemistry

Physical Chemistry

Condensed Matter Physics

DOI

10.1038/ncomms11281

PubMed

27125636

More information

Latest update

9/21/2018