The Au mirror substrate of the eNPoM was used as a working electrode. A stack of square double-sided tape with the centers removed was adhered on a clean glass coverslip to create a fluid chamber. Half of the sample was sandwiched between two coverslips (see fig. S2), and the other half was electrically connected to a potentiostat (CompactStat, Ivium Technologies). A Ag/AgCl reference electrode (3M KCl, eDAQ ET072, Green Leaf Scientific) and a Pt counter electrode (Alfa Aesar) were inserted into the electrochemical cell, and the chamber was filled with the electrolyte solution [0.5 M sodium chloride (NaCl) in 10 mM HCl].

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