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. 2016 Jul 28;6:30543. doi: 10.1038/srep30543

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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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SEM images of (a) the bare TiO₂ NRAs, (b) the cross section image of the bare TiO₂ NRAs, (c) NiFe₂O₄/TiO₂ NRAs, (d) CoFe₂O₄/TiO₂ NRAs, (e) ZnFe₂O₄/TiO₂ NRAs and (f) SrFe₂O₄/TiO₂ NRAs. The insets of (c–f) are the corresponding cross section images. (h,i,g,k) are the EDS results of the red square region in (c–f), respectively.