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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Analysis of structural distortion in Eshelby twisted InP nanowires by scanning precession electron diffraction

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Author(s):
Ugarte, Daniel [1, 2] ; Tizei, Luiz H. G. [3] ; Cotta, Monica A. [1] ; Ducati, Caterina [2] ; Midgley, Paul A. [2] ; Eggeman, Alexander S. [4, 2]
Total Authors: 6
Affiliation:
[1] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS - England
[3] Univ Paris Sud, Lab Phys Solides, CNRS UMR8502, F-91405 Orsay - France
[4] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs - England
Total Affiliations: 4
Document type: Journal article
Source: NANO RESEARCH; v. 12, n. 4, p. 939-946, APR 2019.
Web of Science Citations: 0
Abstract

Transmission electron microscopes (TEM) are widely used in nanotechnology research. However, it is still challenging to characterize nanoscale objects; their small size coupled with dynamical diffraction makes interpreting real- or reciprocal-space data difficult. Scanning precession electron diffraction ((S)PED) represents an invaluable contribution, reducing the dynamical contributions to the diffraction pattern at high spatial resolution. Here a detailed analysis of wurtzite InP nanowires (30-40 nm in diameter) containing a screw dislocation and an associated wire lattice torsion is presented. It has been possible to characterize the dislocation with great detail (Burgers and line vector, handedness). Through careful measurement of the strain field and comparison with dynamical electron diffraction simulations, this was found to be compatible with a Burgers vector modulus equal to one hexagonal lattice cell parameter despite the observed crystal rotation rate being larger (ca. 20%) than that predicted by classical elastic theory for the nominal wire diameter. These findings corroborate the importance of the (S)PED technique for characterizing nanoscale materials. (AU)

FAPESP's process: 13/02300-1 - Semiconductor nanowires: formation mechanisms and biosensing applications
Grantee:Mônica Alonso Cotta
Support type: Regular Research Grants
FAPESP's process: 13/10957-0 - Xylella fastidiosa-vector-host plant interaction and approaches for citrus variegated chlorosis and citrus canker control
Grantee:Alessandra Alves de Souza
Support type: Research Projects - Thematic Grants