title: Effect of nanopore geometry on ion current rectification.
abstract: We present the results of systematic studies of ion current rectification performed on artificial asymmetric nanopores with different geometries and dimensions. The nanopores are 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 the pore profile and dimensions is achieved. The pore geometry is characterized in detail using field-emission scanning electron microscopy. The dependence of the ion current rectification ratio on the pore length, tip diameter, and the degree of pore taper is analysed. The experimental data are compared to the calculations based on the Poisson-Nernst-Planck equations. A strong effect of the tip geometry on the diode-like behaviour is confirmed.
authors.affiliation: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Joliot-Curie str. 6, 141980 Dubna, Russia. apel@nrmail.jinr.ru
authors.forename: Pavel Yu
authors.initials: PY
authors.lastname: Apel
authors.forename: Irina V
authors.initials: IV
authors.lastname: Blonskaya
authors.forename: Oleg L
authors.initials: OL
authors.lastname: Orelovitch
authors.forename: Patricio
authors.initials: P
authors.lastname: Ramirez
authors.forename: Bozena A
authors.initials: BA
authors.lastname: Sartowska