Fig. 2. Fabrication and application of the encoded MNs. (A) Schematic illustration of the fabrication of the encoded MNs. (B) Schematic illustration of the application of the MNs in ISF detection. (C) Barcodes with color in negative molds. (D) Optical image of MNs with one barcode loaded in a single tip. (E) Scanning electron microscope (SEM) images of a one-barcode-loaded MN. (F) The whole view of the barcode with inverse opal structure (reproduced from ref. 70 with the permission of John Wiley & Sons, Inc, Copyright 2019).
