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Appl. Sci. 2015, 5(4), 728-746; doi:10.3390/app5040728

Phonon Spectrum Engineering in Rolled-up Micro- and Nano-Architectures

1
Institute for Integrative Nanosciences (IIN), Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Dresden D-01069, Germany
2
Phonon Optimized Engineered Materials (POEM) Center, Department of Electrical and Computer Engineering, University of California-Riverside, Riverside, CA 92521, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Philippe Lambin
Received: 19 August 2015 / Accepted: 22 September 2015 / Published: 10 October 2015
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
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Abstract

We report on a possibility of efficient engineering of the acoustic phonon energy spectrum in multishell tubular structures produced by a novel high-tech method of self-organization of micro- and nano-architectures. The strain-driven roll-up procedure paved the way for novel classes of metamaterials such as single semiconductor radial micro- and nano-crystals and multi-layer spiral micro- and nano-superlattices. The acoustic phonon dispersion is determined by solving the equations of elastodynamics for InAs and GaAs material systems. It is shown that the number of shells is an important control parameter of the phonon dispersion together with the structure dimensions and acoustic impedance mismatch between the superlattice layers. The obtained results suggest that rolled up nano-architectures are promising for thermoelectric applications owing to a possibility of significant reduction of the thermal conductivity without degradation of the electronic transport. View Full-Text
Keywords: multishell tubular structures; rolled-up micro- and nano-architectures; acoustic phonon energy spectrum multishell tubular structures; rolled-up micro- and nano-architectures; acoustic phonon energy spectrum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fomin, V.M.; Balandin, A.A. Phonon Spectrum Engineering in Rolled-up Micro- and Nano-Architectures. Appl. Sci. 2015, 5, 728-746.

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