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Functionalization mediates heat transport in graphene nanoflakes

Research output: Contribution to journalJournal article

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  • 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
  • Sebastian Volz
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Article number11281
<mark>Journal publication date</mark>29/04/2016
<mark>Journal</mark>Nature Communications
Volume7
Number of pages9
Publication statusPublished
Original languageEnglish

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.