Abstract
Ionic transport through single quartz nanopipettes is studied by cyclic voltammetry and multi-frequency impedance spectroscopy. DC current rectification is correlated to the features in the two dimensional impedance Nyquist plots, by varying the ionic strength tailored by solution electrolyte concentration. Normalized conductivity is relatively comparable in different electrolyte concentrations at negative potentials, but is drastically enhanced at lower concentration at positive bias potentials. By employing electrolytes with common anions but different cations, the respective contribution of cation and anion transport to the overall ionic current is qualitatively differentiated. The phenomena are attributed to the fixed charges at the substrate-solution interface. Interestingly, the amount of fixed interfacial charges, or surface charge density at the mass transport limiting region, was found to develop over time, which results in more significant current rectification.
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