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
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of California, Riverside, CA (United States); University of California, Riverside
  2. Univ. of California, Riverside, CA (United States)

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:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012670
OSTI ID:
1223601
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 107; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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