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. 2016 Apr 13;6:24189. doi: 10.1038/srep24189

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(a) Bright field TEM image and SAED pattern of polycrystalline Fe NWs before annealing. Fe-Fe₃O₄ core-shell NWs (b) after 20 min of annealing and (c) after 24 hours of annealing.