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In Situ Transmission Electron Microscopy Observations of the Growth Process of Fe3O4–Ag Nanoparticles

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The properties of nanocrystals are highly dependent on their morphology, composition and structure. To obtain full control over their properties, the behavior of nanocrystals under external stimuli, such as heat treatment, needs to be understood. Herein, to in situ observe their microstructure and morphology changes, Fe3O4–Ag heterodimers were selected as a model system. Their structural changes after heat treatment were investigated by in situ transmission electron microscopy. A combination of real-time imaging with elemental analysis enabled observation of the transformation of Fe3O4–Ag heterodimers having a loose interface configuration to those with a Janus structure at the atomic scale after heating from room temperature to 600 °C. After incubation at 600 °C for 32 min, two kinds of Janus structures could be seen, including a clear linear interface in the Fe3O4–Ag heterodimers and a semi-crescent-shaped interface between the Ag and Fe3O4 nanoparticles (NPs). These dynamic observations provide unique insights into NP growth mechanisms, which are essential for understanding and controlling the structure and morphology of nanoparticles.

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Acknowledgements

This work was financially supported by the Zhejiang Provincial Natural Science Foundation of China (No. LD19E010001) and the National Natural Science Foundation of China (Nos. 51771219, 51771095 and 51771220).

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Authors and Affiliations

  1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, China

    Jing-Hua Liu & Jin-Jun Liu

  2. CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    Jing-Hua Liu, Bao-Ru Bian & Juan Du

  3. Institute of Materials, Shanghai University, Shanghai, 200444, China

    Qiang Zheng & Juan Du

Authors
  1. Jing-Hua Liu
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  2. Jin-Jun Liu
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  3. Qiang Zheng
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  4. Bao-Ru Bian
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  5. Juan Du
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Corresponding authors

Correspondence to Qiang Zheng, Bao-Ru Bian or Juan Du.

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Available online at http://link.springer.com/journal/40195.

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Liu, JH., Liu, JJ., Zheng, Q. et al. In Situ Transmission Electron Microscopy Observations of the Growth Process of Fe3O4–Ag Nanoparticles. Acta Metall. Sin. (Engl. Lett.) 33, 1283–1288 (2020). https://doi.org/10.1007/s40195-020-01053-9

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  • DOI: https://doi.org/10.1007/s40195-020-01053-9

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