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Quantitative two-dimensional strain mapping of small core-shell FePt@Fe3O4 nanoparticles

Monteforte, M; Kobayashi, S; Tung, LD; Higashimine, K; Mott, DM; Maenosono, S; Thanh, NTK; (2016) Quantitative two-dimensional strain mapping of small core-shell FePt@Fe3O4 nanoparticles. NEW JOURNAL OF PHYSICS , 18 (033016) 10.1088/1367-2630/18/3/033016. Green open access

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Abstract

We report a facile one-pot chemical synthesis of colloidal FePt@Fe3O4 core–shell nanoparticles (NPs) with an average diameter of 8.7 ± 0.4 nm and determine their compositional morphology, microstructure, two-dimensional strain, and magnetic hysteresis. Using various state-of-the-art analytical transmission electron microscopy (TEM) characterization techniques—including high resolution TEM imaging, TEM tomography, scanning TEM-high angle annular dark field imaging, and scanning TEM-energy dispersive x-ray spectroscopy elemental mapping—we gain a comprehensive understanding of the chemical and physical properties of FePt@Fe3O4 NPs. Additional analysis using x-ray photoelectron spectroscopy, x-ray diffraction, and superconducting quantum interference device magnetometry distinguishes the oxide phase and determines the magnetic properties. The geometric phase analysis method is effective in revealing interfacial strain at the core–shell interface. This is of fundamental interest for strain engineering of nanoparticles for desirable applications.

Type: Article
Title: Quantitative two-dimensional strain mapping of small core-shell FePt@Fe3O4 nanoparticles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1367-2630/18/3/033016
Publisher version: http://dx.doi.org/10.1088/1367-2630/18/3/033016
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: core-shell, nanoparticle structure, lattice strain, geometric phase
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1485890
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