Year: 2016
Type: article
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.
Source: Nature Communications
DOI: 10.1038/ncomms11281
Institutions: Centre National de la Recherche Scientifique, Université Paris-Saclay, CentraleSupélec, Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion, Shanghai University, Chalmers University of Technology, University of Minnesota, Minnesota State University, Mankato, Al-Qasim Green University, Lancaster University, Max Planck Institute for Polymer Research, Aalto University, Smart High Tech (Sweden), Russian Academy of Sciences, Semenov Institute of Chemical Physics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Awards: Transition-edge sensors: achieving true potential, Skalbar Nanomaterial och lösning bearbetningsbar TEG, G3085744705, Innovative Nano and Micro Technologies for Advanced Thermo and Mechanical Interfaces, ULTRA-HIGH-RESOLUTION, ULTRA-SENSITIVE MULTIFUNCTIONAL BALLISTIC NANO SENSORS FOR THE SIMULTANEOUS DETECTION OF MAGNETIC, ELECTRIC AND OPTICAL FIELDS, G6479653053, Medium effects in single molecule electronics, Molecular quantum devices, Kolbaserat höghastighet 3D GaN elektroniksystem, Quantum Effects in Electronic Nanodevices (QuEEN), "MOLECULAR-SCALE ELECTRONICS: Concepts, Contacts and Stability ""MOLESCO"""
OpenAlex ID: W2298606405