Issue 21, 2013

Phonon spectroscopy in a Bi2Te3 nanowire array

Abstract

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

Article information

Article type
Paper
Submitted
05 Jun 2013
Accepted
15 Aug 2013
First published
20 Aug 2013

Nanoscale, 2013,5, 10629-10635

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements