Functionalization mediates heat transport in graphene nanoflakes

Haoxue Han, Yong Zhang, Nan Wang, Majid Kabiri Samani, Yuxiang Ni, Zainelabideen Y. Mijbil, Michael Edwards, Shiyun Xiong, Kimmo Sääskilahti, Murali Murugesan, Yifeng Fu, Lilei Ye, Hatef Sadeghi, Steven Bailey, Yuriy A. Kosevich, Colin J. Lambert (), Johan Liu () and Sebastian Volz ()
Additional contact information
Haoxue Han: Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, Grande Voie des Vignes
Yong Zhang: SMIT Center, School of Automation and Mechanical Engineering and Institute of NanomicroEnergy, Shanghai University
Nan Wang: Electronics Materials and Systems Laboratory, Chalmers University of Technology
Majid Kabiri Samani: Electronics Materials and Systems Laboratory, Chalmers University of Technology
Yuxiang Ni: University of Minnesota
Zainelabideen Y. Mijbil: Quantum Technology Center, Lancaster University
Michael Edwards: Electronics Materials and Systems Laboratory, Chalmers University of Technology
Shiyun Xiong: Max Planck Institute for Polymer Research
Kimmo Sääskilahti: Aalto University
Murali Murugesan: Electronics Materials and Systems Laboratory, Chalmers University of Technology
Yifeng Fu: Electronics Materials and Systems Laboratory, Chalmers University of Technology
Lilei Ye: SHT Smart High Tech AB
Hatef Sadeghi: Quantum Technology Center, Lancaster University
Steven Bailey: Quantum Technology Center, Lancaster University
Yuriy A. Kosevich: Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, Grande Voie des Vignes
Colin J. Lambert: Quantum Technology Center, Lancaster University
Johan Liu: SMIT Center, School of Automation and Mechanical Engineering and Institute of NanomicroEnergy, Shanghai University
Sebastian Volz: Laboratoire EM2C, CNRS, CentraleSupélec, Université Paris-Saclay, Grande Voie des Vignes

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract 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 ∼28 °C for a chip operating at 1,300 W cm−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.

Date: 2016
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DOI: 10.1038/ncomms11281

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