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Hydrothermal synthesis, off-axis electron holography and magnetic properties of Fe3O4 nanoparticles

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, , Citation Trevor P Almeida et al 2014 J. Phys.: Conf. Ser. 522 012062 DOI 10.1088/1742-6596/522/1/012062

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1 Department of Earth Science and Engineering, South Kensington Campus, Imperial College London, London, SW7 2AZ, UK

2 School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3JW, UK

3 Centre for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark

4 Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, D-52425 Jülich, Germany

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1742-6596/522/1/012062

Abstract

The hydrothermal synthesis of Fe3O4 nanoparticles (NPs) (< 50 nm) from mixed FeCl3 / FeCl2 precursor solution at pH ~ 12 has been confirmed using complementary characterisation techniques of transmission electron microscopy and X-ray diffractometry. Off-axis electron holography allowed for visualisation of their single domain (SD) nature, as well as inter-particle interactions, with the latter attributed to explain the pseudo-SD/multi-domain behaviour demonstrated by bulk magnetic measurements.

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10.1088/1742-6596/522/1/012062