Low-temperature thermal conductivity in polycrystalline graphene
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research 141980 Dubna, Moscow region, Russia
Received: 25 May 2012
Accepted: 24 September 2012
The low-temperature thermal conductivity in polycrystalline graphene is theoretically studied. The contributions from three branches of acoustic phonons are calculated by taking into account scattering on sample borders, point defects and grain boundaries. Phonon scattering due to sample borders and grain boundaries is shown to result in a Tα-behaviour in the thermal conductivity where α varies between 1 and 2. This behaviour is found to be more pronounced for nanosized grain boundaries.
PACS: 65.80.Ck – Thermal properties of graphene / 81.05.ue – Graphene / 73.43.Cd – Theory and modeling
© EPLA, 2012