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(A) Schematic diagram of the transdermal detection of glucose in vivo using the F-PMMA MN array based on surface-enhanced Raman spectroscopy. Reproduced with permission (Ju et al., 2020). Copyright 2020, American Chemical Society. (B) Scheme of the NFMN-SERS sensor for an intradermal detection. The inset image shows the flower-like nanostructures formed on the MN structure. Reproduced with permission (Li H. et al., 2021). Copyright 2021, Elsevier.
