Figure 6
(a) Optical image of α-Fe2O3 substrate illuminated with 100 × objective with closed hexagonal aperture diaphragm. The brightest part corresponds to light reflected from a Pt microelectrode of 12.5 μm (radius) positioned 10 µm above the sample. (b) SECM image (SG/TC mode) of the illuminated part of the α-Fe2O3 sample. Electrolyte: 0.5 M NaOH, sample potential: + 0.7 V, tip potential: − 0.6 V, scanning rate: 10 µm/s. (c) Experimental and fitted cross-section indicated Inset interpolated image of (b) with white line showing cross-section extraction, (d) table represent fitted parameters.
