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X‐ray diffraction reveals the amount of strain and homogeneity of extremely bent single nanowires
Author(s) -
Davtyan Arman,
Kriegner Dominik,
Holý Václav,
AlHassan Ali,
Lewis Ryan B.,
McDermott Spencer,
Geelhaar Lutz,
Bahrami Danial,
Anjum Taseer,
Ren Zhe,
Richter Carsten,
Novikov Dmitri,
Müller Julian,
Butz Benjamin,
Pietsch Ullrich
Publication year - 2020
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576720011516
Subject(s) - bent molecular geometry , homogeneity (statistics) , nanowire , materials science , diffraction , bending , crystallography , composite material , optics , nanotechnology , chemistry , physics , statistics , mathematics
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.