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. 2022 Mar 11;207:114182. doi: 10.1016/j.bios.2022.114182

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Fig. 2 — (A) Scanning electron microscopy image of the Au UME (As indicated by the red arrow). (B) Cyclic voltammogram of the Au UME in 0.5 M H₂SO₄. (Inset: schematic drawing of an Au UME). Cyclic voltammograms of three different Au UMEs before (C) and after (D) being polished in 5 mM K₃Fe(CN)₆/0.1 M KCl (scan rate: 10 mV/s).