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Bending and Twisting Lattice Tilt in Strained Core-Shell Nanowires Revealed by Nanofocused X-ray Diffraction

Wallentin, Jesper LU ; Jacobsson, Daniel LU ; Osterhoff, Markus; Borgström, Magnus T. LU and Salditt, Tim (2017) In Nano Letters 17(7). p.4143-4150
Abstract

We have investigated strained GaAs-GaInP core-shell nanowires using transmission electron microscopy and nanofocused scanning X-ray diffraction. Nominally identical growth conditions for each sample were achieved by using nanoimprint lithography to create wafer-scale arrays of Au seed particles. However, we observe large individual differences, with neighboring nanowires showing either straight, bent, or twisted morphology. Using scanning X-ray diffraction, we reconstructed and quantified the bending and twisting of the nanowires in three dimensions. In one nanowire, we find that the shell lattice is tilted with respect to the core lattice, with an angle that increases from 2° at the base to 5° at the top. Furthermore, the azimuthal... (More)

We have investigated strained GaAs-GaInP core-shell nanowires using transmission electron microscopy and nanofocused scanning X-ray diffraction. Nominally identical growth conditions for each sample were achieved by using nanoimprint lithography to create wafer-scale arrays of Au seed particles. However, we observe large individual differences, with neighboring nanowires showing either straight, bent, or twisted morphology. Using scanning X-ray diffraction, we reconstructed and quantified the bending and twisting of the nanowires in three dimensions. In one nanowire, we find that the shell lattice is tilted with respect to the core lattice, with an angle that increases from 2° at the base to 5° at the top. Furthermore, the azimuthal orientation of the tilt changes by 30° along the nanowire axis. Our results demonstrate how strained core-shell nanowire growth can lead to a rich interplay of composition, lattice mismatch, bending and lattice tilt, with additional degrees of complexity compared with thin films.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
core-shell, Nanowires, strain, transmission electron microscopy, X-ray diffraction
in
Nano Letters
volume
17
issue
7
pages
8 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85024123423
  • wos:000405643300021
ISSN
1530-6984
DOI
10.1021/acs.nanolett.7b00918
language
English
LU publication?
yes
id
d311a722-d77a-44df-b92a-41c023f0fe13
date added to LUP
2017-07-27 10:09:36
date last changed
2017-09-18 11:40:01
@article{d311a722-d77a-44df-b92a-41c023f0fe13,
  abstract     = {<p>We have investigated strained GaAs-GaInP core-shell nanowires using transmission electron microscopy and nanofocused scanning X-ray diffraction. Nominally identical growth conditions for each sample were achieved by using nanoimprint lithography to create wafer-scale arrays of Au seed particles. However, we observe large individual differences, with neighboring nanowires showing either straight, bent, or twisted morphology. Using scanning X-ray diffraction, we reconstructed and quantified the bending and twisting of the nanowires in three dimensions. In one nanowire, we find that the shell lattice is tilted with respect to the core lattice, with an angle that increases from 2° at the base to 5° at the top. Furthermore, the azimuthal orientation of the tilt changes by 30° along the nanowire axis. Our results demonstrate how strained core-shell nanowire growth can lead to a rich interplay of composition, lattice mismatch, bending and lattice tilt, with additional degrees of complexity compared with thin films.</p>},
  author       = {Wallentin, Jesper and Jacobsson, Daniel and Osterhoff, Markus and Borgström, Magnus T. and Salditt, Tim},
  issn         = {1530-6984},
  keyword      = {core-shell,Nanowires,strain,transmission electron microscopy,X-ray diffraction},
  language     = {eng},
  month        = {07},
  number       = {7},
  pages        = {4143--4150},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Bending and Twisting Lattice Tilt in Strained Core-Shell Nanowires Revealed by Nanofocused X-ray Diffraction},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.7b00918},
  volume       = {17},
  year         = {2017},
}