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Chemical evidence that GSH self-assembles on gold electrode. (a) High-resolution XPS spectra for a gold electrode after contact with Fc–Ru3+ mediator solution containing GSH (10 μM). (b) Atomic ratios of N 1s/Au 4f and C 1s/Au 4f obtained from survey scans for gold electrodes contacted with Fc–Ru3+ mediator solution containing varying GSH concentrations.
