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Title: Acoustic phonon spectrum and thermal transport in nanoporous alumina arrays

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4934883· OSTI ID:1223601

We report results of a combined investigation of thermal conductivity and acoustic phonon spectra in nanoporous alumina membranes with the pore diameter decreasing from D=180 nm to 25 nm. The samples with the hexagonally arranged pores were selected to have the same porosity Ø ≈13%. The Brillouin-Mandelstam spectroscopy measurements revealed bulk-like phonon spectrum in the samples with D = 180 nm pores and spectral features, which were attributed to spatial confinement, in the samples with 25 nm and 40 nm pores. The velocity of the longitudinal acoustic phonons was reduced in the samples with smaller pores. As a result, analysis of the experimental data and calculated phonon dispersion suggests that both phonon-boundary scattering and phonon spatial confinement affect heat conduction in membranes with the feature sizes D < 40 nm.

Research Organization:
Univ. of California, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012670
OSTI ID:
1223601
Journal Information:
Applied Physics Letters, Vol. 107, Issue 18; Conference: Brillouin-Mandelstam Light Scattering Spectroscopy of the Nanoscale Phononic Superlattice Arrays, Nonlinear Optics 2015, Kauai, HI (United States), 26-31 Jul 2015; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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The Discrete Noise of Magnons text January 2018
Revealing carbon mediated luminescence centers with enhanced lifetime in porous alumina journal October 2019
Heat conduction tuning by wave nature of phonons journal August 2017
Investigation of phonon coherence and backscattering using silicon nanomeshes journal January 2017
Effect of interlayer on interfacial thermal transport and hot electron cooling in metal-dielectric systems: An electron-phonon coupling perspective journal February 2016
Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels journal January 2020
Thermal Transport in 3D Nanostructures journal August 2019
The discrete noise of magnons journal March 2019
Thermal Properties of the Binary‐Filler Hybrid Composites with Graphene and Copper Nanoparticles journal August 2019
Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms journal May 2018
Dual-Functional Graphene Composites for Electromagnetic Shielding and Thermal Management journal October 2018