Phonon spectroscopy in a Bi2Te3 nanowire array

Dimitrios Bessas; William Töllner; Zainul Aabdin; Nicola Peranio; Ilya Sergueev; Hans Christian Wille; Oliver Eibl; Kornelius Nielsch; Raphaël P. Hermann

doi:10.1039/c3nr02918b

Phonon spectroscopy in a Bi₂Te₃ nanowire array

Dimitrios Bessas, William Töllner, Zainul Aabdin, Nicola Peranio, Ilya Sergueev, Hans Christian Wille, Oliver Eibl, Kornelius Nielsch, Raphaël P. Hermann

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The lattice dynamics in an array of 56 nm diameter Bi₂Te ₃ 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 Bi ₂Te₃ 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.

Original language	English
Pages (from-to)	10629-10635
Number of pages	7
Journal	Nanoscale
Volume	5
Issue number	21
DOIs	https://doi.org/10.1039/c3nr02918b
State	Published - Nov 7 2013
Externally published	Yes

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title = "Phonon spectroscopy in a Bi2Te3 nanowire array",

abstract = "The lattice dynamics in an array of 56 nm diameter Bi2Te 3 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 Bi 2Te3 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.",

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doi = "10.1039/c3nr02918b",

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T1 - Phonon spectroscopy in a Bi2Te3 nanowire array

AU - Bessas, Dimitrios

AU - Töllner, William

AU - Aabdin, Zainul

AU - Peranio, Nicola

AU - Sergueev, Ilya

AU - Wille, Hans Christian

AU - Eibl, Oliver

AU - Nielsch, Kornelius

AU - Hermann, Raphaël P.

PY - 2013/11/7

Y1 - 2013/11/7

N2 - The lattice dynamics in an array of 56 nm diameter Bi2Te 3 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 Bi 2Te3 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.

AB - The lattice dynamics in an array of 56 nm diameter Bi2Te 3 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 Bi 2Te3 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.

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Phonon spectroscopy in a Bi₂Te₃ nanowire array

Abstract

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