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. 2016 Feb 23;6:21792. doi: 10.1038/srep21792

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(A) Atomic percentages of Fe, O, and C from EDX analysis. (B) Raman spectrum using 532-nm laser excitation of the synthesized Fe₃O₄ nanostructures. (C) Extended TEM image of Fe₃O₄@C nanostructures. (D) Higher-magnification TEM image of a group of Fe₃O₄@ C nanostructures.