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. 2017 Jan 16;7:40497. doi: 10.1038/srep40497

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Copyright © 2017, 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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TEM-HAADF image of (a) 450 °C, and (b) 750 °C annealed Fe₂O₃/Al₂O₃. In Fe₂O₃/Al₂O₃ sample, Fe₂O₃ nanoparticles are uniformly distributed (a,b), and as annealing temperature increased from (a) 450 °C to (b) 750 °C, the particle size of Fe₂O₃ increased.