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. 2019 Dec 16;22(1):8. doi: 10.1007/s10544-019-0456-z

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© The Author(s) 2020

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Fig. 2 — Computer-aided design of (a) the structured MN, and (b) the non-structured MN. The corresponding SEM images of (c) the structured MN, and (d) the non-structured MN