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Issue 21, 2013
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Phonon spectroscopy in a Bi2Te3 nanowire array

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The lattice dynamics in an array of 56 nm diameter Bi2Te3 nanowires embedded in a self-ordered amorphous alumina membrane were investigated microscopically using 125Te nuclear inelastic scattering. The element specific density of phonon states is measured on nanowires in two perpendicular orientations and the speed of sound is extracted. Combined high energy synchrotron radiation diffraction and transmission electron microscopy was carried out on the same sample and the crystallinity was investigated. The nanowires grow almost perpendicular to the c-axis, partly with twinning. The average speed of sound in the 56 nm diameter Bi2Te3 nanowires is ∼7% smaller with respect to bulk Bi2Te3 and a decrease in the macroscopic lattice thermal conductivity by ∼13% due to nanostructuration and to the reduced speed of sound is predicted.

Graphical abstract: Phonon spectroscopy in a Bi2Te3 nanowire array

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Publication details

The article was received on 05 Jun 2013, accepted on 15 Aug 2013 and first published on 20 Aug 2013

Article type: Paper
DOI: 10.1039/C3NR02918B
Citation: Nanoscale, 2013,5, 10629-10635
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    Phonon spectroscopy in a Bi2Te3 nanowire array

    D. Bessas, W. Töllner, Z. Aabdin, N. Peranio, I. Sergueev, H. Wille, O. Eibl, K. Nielsch and R. P. Hermann, Nanoscale, 2013, 5, 10629
    DOI: 10.1039/C3NR02918B

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