Characteristic length of phonon transport within periodic nanoporous thin films and two-dimensional materials
AffiliationUniv Arizona, Dept Aerosp & Mech Engn
MetadataShow full item record
PublisherAMER INST PHYSICS
CitationJ. Appl. Phys. 120, 065101 (2016); doi: 10.1063/1.4959984
JournalJOURNAL OF APPLIED PHYSICS
RightsPublished by AIP Publishing.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractIn the past two decades, phonon transport within nanoporous thin films has attracted enormous attention for their potential applications in thermoelectrics and thermal insulation. Various computational studies have been carried out to explain the thermal conductivity reduction within these thin films. Considering classical phonon size effects, the lattice thermal conductivity can be predicted assuming diffusive pore-edge scattering of phonons and bulk phonon mean free paths. Following this, detailed phonon transport can be simulated for a given porous structure to find the lattice thermal conductivity [Hao et al., J. Appl. Phys. 106, 114321 (2009)]. However, such simulations are intrinsically complicated and cannot be used for the data analysis of general samples. In this work, the characteristic length K-Pore of periodic nanoporous thin films is extracted by comparing the predictions of phonon Monte Carlo simulations and the kinetic relationship using bulk phonon mean free paths modified by K-Pore. Under strong ballistic phonon transport, K-Pore is also extracted by the Monte Carlo ray-tracing method for graphene with periodic nanopores. The presented model can be widely used to analyze the measured thermal conductivities of such nanoporous structures. Published by AIP Publishing.
NotePublished Online: August 2016; 12 Month Embargo.
VersionFinal published version