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X-ray diffraction reveals the amount of strain and homogeneity of extremely bent single nanowires

Davtyan, Arman ; Kriegner, Dominik ; Holý, Václav ; AlHassan, Ali ; Lewis, Ryan B. ; McDermott, Spencer ; Geelhaar, Lutz ; Bahrami, Danial ; Anjum, Taseer and Ren, Zhe LU , et al. (2020) In Journal of Applied Crystallography 53. p.1310-1320
Abstract

Core-shell nanowires (NWs) with asymmetric shells allow for strain engineering of NW properties because of the bending resulting from the lattice mismatch between core and shell material. The bending of NWs can be readily observed by electron microscopy. Using X-ray diffraction analysis with a micro- and nano-focused beam, the bending radii found by the microscopic investigations are confirmed and the strain in the NW core is analyzed. For that purpose, a kinematical diffraction theory for highly bent crystals is developed. The homogeneity of the bending and strain is studied along the growth axis of the NWs, and it is found that the lower parts, i.e. close to the substrate/wire interface, are bent less than the parts further up.... (More)

Core-shell nanowires (NWs) with asymmetric shells allow for strain engineering of NW properties because of the bending resulting from the lattice mismatch between core and shell material. The bending of NWs can be readily observed by electron microscopy. Using X-ray diffraction analysis with a micro- and nano-focused beam, the bending radii found by the microscopic investigations are confirmed and the strain in the NW core is analyzed. For that purpose, a kinematical diffraction theory for highly bent crystals is developed. The homogeneity of the bending and strain is studied along the growth axis of the NWs, and it is found that the lower parts, i.e. close to the substrate/wire interface, are bent less than the parts further up. Extreme bending radii down to ∼3 μm resulting in strain variation of ∼2.5% in the NW core are found.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bent crystals, Nano-focused X-ray beams, Nanowires
in
Journal of Applied Crystallography
volume
53
pages
11 pages
publisher
International Union of Crystallography
external identifiers
  • pmid:33117111
  • scopus:85092573337
ISSN
0021-8898
DOI
10.1107/S1600576720011516
language
English
LU publication?
yes
id
0e94a211-ccb9-4730-a729-dbe4262406d2
date added to LUP
2020-11-09 13:07:20
date last changed
2025-01-10 22:31:05
@article{0e94a211-ccb9-4730-a729-dbe4262406d2,
  abstract     = {{<p>Core-shell nanowires (NWs) with asymmetric shells allow for strain engineering of NW properties because of the bending resulting from the lattice mismatch between core and shell material. The bending of NWs can be readily observed by electron microscopy. Using X-ray diffraction analysis with a micro- and nano-focused beam, the bending radii found by the microscopic investigations are confirmed and the strain in the NW core is analyzed. For that purpose, a kinematical diffraction theory for highly bent crystals is developed. The homogeneity of the bending and strain is studied along the growth axis of the NWs, and it is found that the lower parts, i.e. close to the substrate/wire interface, are bent less than the parts further up. Extreme bending radii down to ∼3 μm resulting in strain variation of ∼2.5% in the NW core are found. </p>}},
  author       = {{Davtyan, Arman and Kriegner, Dominik and Holý, Václav and AlHassan, Ali and Lewis, Ryan B. and McDermott, Spencer and Geelhaar, Lutz and Bahrami, Danial and Anjum, Taseer and Ren, Zhe and Richter, Carsten and Novikov, Dmitri and Müller, Julian and Butz, Benjamin and Pietsch, Ullrich}},
  issn         = {{0021-8898}},
  keywords     = {{Bent crystals; Nano-focused X-ray beams; Nanowires}},
  language     = {{eng}},
  pages        = {{1310--1320}},
  publisher    = {{International Union of Crystallography}},
  series       = {{Journal of Applied Crystallography}},
  title        = {{X-ray diffraction reveals the amount of strain and homogeneity of extremely bent single nanowires}},
  url          = {{http://dx.doi.org/10.1107/S1600576720011516}},
  doi          = {{10.1107/S1600576720011516}},
  volume       = {{53}},
  year         = {{2020}},
}