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Fabrication and characterization of the CHMN patch: (a) scheme of the fabrication process for CHMN; (b) digital photograph of the CHMN patch; (c) micrograph of the CHMN patch; (d) SEM image of the CHMN; (e) magnified SEM image of the individual MN. Scare bars are 5 mm, 500 μm, 500 μm and 100 μm in (b–e), respectively.
