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. 2016 Oct 18;6:35477. doi: 10.1038/srep35477

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) UV–Vis absorption spectrum of the γ-Fe₂O₃ and γ-Fe₂O₃@Au nanoparticles. The plasmonic absorption peak of the γ-Fe₂O₃@Au nanoparticles is approximately 536 nm. (b) Hysteresis curve of the γ-Fe₂O₃@Au nanoparticles measured by the SQUID MPMS system at 300 K. (c) The powder XRD pattern of the synthesised γ-Fe₂O₃@Au nanoparticles.