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(a) The SEM characterization of the bare screen-printed electrode (SPE) and (b) the multi-walled carbon nanotubes modified screen-printed electrode. Reprinted from Ref. [57] with permission from MDPI. Schematic representation of (c) SPE preparation, (d) images of the final device, and (e) the final SPE connected to the potentiostat. Reprinted with permission from Ref. [59]. Copyright (2020) Elsevier.
