Functionalization mediates heat transport in graphene nanoflakes - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2016

Functionalization mediates heat transport in graphene nanoflakes

Nan Wang
  • Function : Author
  • PersonId : 763528
  • IdRef : 169125947
Yuxiang Ni
  • Function : Author
  • PersonId : 771210
  • IdRef : 177217626
Shiyun Xiong
Lilei Ye
  • Function : Author

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 B28°C for a chip operating at 1,300 W cm À 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.
Fichier principal
Vignette du fichier
ncomms11281_file_editeur.pdf (999.88 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-01336749 , version 1 (23-07-2020)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Haoxue Han, Yong Zhang, Nan Wang, Majid Kabiri Samani, Yuxiang Ni, et al.. Functionalization mediates heat transport in graphene nanoflakes. Nature Communications, 2016, ⟨10.1038/ncomms11281⟩. ⟨hal-01336749⟩
103 View
47 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More