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(Top) Schematic of a nanogap cell during redox cycling of a single-molecule. (bottom) Experimentally measured current-time trace measured at the top (blue) and bottom (red) electrodes. Occasions where a single FcTMA0/+ molecule enters the gap and undergoes redox cycling, are visible by correlated increases/decreases in the current at the top/bottom electrode. The ability to detect a single molecule is due to rapid redox cycling. Adapted from reference 65.
