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(A) The preparation of the capillary with the Pt ring at the nanotip. (B–E) SEM imaging of the capillary tip coated with the Pt layer (B shows side view, and C shows front view) and the Pt-coated tip covered with wax (D shows side view, and E shows front view). (Scale bars: 500 nm.) (F) Voltammetry of the Pt ring at the tip in 100 mM PBS with 5 mM ferrocyanide. The scan rate was 100 mV/s.
