Abstract
We present the results of systematic studies of ion current rectification performed onartificial asymmetric nanopores with different geometries and dimensions. The nanoporesare fabricated by the ion track etching method using surfactant-doped alkaline solutions.By varying the alkali concentration in the etchant and the etching time, control over thepore profile and dimensions is achieved. The pore geometry is characterized in detail usingfield-emission scanning electron microscopy. The dependence of the ion current rectificationratio on the pore length, tip diameter, and the degree of pore taper is analysed. Theexperimental data are compared to the calculations based on the Poisson–Nernst–Planckequations. A strong effect of the tip geometry on the diode-like behaviour is confirmed.
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