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. 2017 Mar 10;7:144. doi: 10.1038/s41598-017-00157-0

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© The Author(s) 2017

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Characterization results of Ni60s/Cu90s sample. (a) The TEM and element EDS mapping image of the single nanowire; (b) the same nanowire after annealing at 700 °C for 2 h in air. (c) EDS result of the tubular structure that has been labelled by arrow in (b); (d) EDS mapping image of the nanostructure in (b).