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(A) Schematic for the preparation of PVDF-PEI/Anti-METH, (B) CV, (C) DPV, and (D) EIS of (a) bare, (b) PVDF-PEI, and (c) PVDF-PEI/Anti-METH-modified surfaces before and after the (d) addition of METH-DNC [in PBS (50 mM, pH 7.4), 5.0 mM [Fe(CN)6]3–/4– and 0.1 M KCl were used during the measurement. The used METH concentration is 2.0 ng/mL].
