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. 2015 Jan 7;5:7659. doi: 10.1038/srep07659

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(a) Ni-NPs prepared by solution reaction. (b) Ni–C core-shell structure fabricated by template-directed carbon segregation method. (c) Hollow CNSs obtained after HCl etching. (d) CNS film deposited on stainless steel by the electrophoretic deposition technique. (e) CNS/Si obtained after silicon deposition with PECVD. (f) CNS/Si/Al₂O₃ obtained after Al₂O₃ deposition with ALD. (g) The inner structure of CNS/Si/Al₂O₃.