The tip current vs. distance curves were recorded with sampling frequency of 20 kHz.
In situ SECM images confirmed the weakened tip current of chalcopyrite region after HATT adsorption.
To solve this problem, we proposed a tip current signal/positioning close-loop mode in which the tip current signal is fed back to the positioning system in order to program the motion trial of SECM tip.
In tip voltammogram, the ORR tip current qualitatively reflects the transit solution pH changes during LaNi5−xAlx discharge reaction.
The scratch groove and the whole deformed region caused by scratching as anode corresponded to the peak of tip current.
However, at higher anodic polarizations, nitinol passive layers experience breakdown, and therefore tip current values reflect the release of metal cations from the biomaterial surface.
Moreover, the decrease in tip current of released Fe CN 64− with increasing cycle number accounted for the ion exchange between Fe CN 64− and Cl− in the KCl electrolyte.
A more insulating film was found on nitinol when biased at low polarizations, resulting in smaller tip current increments during tip approach to the investigated surface under positive feedback and competition operation modes.
