Ion Track Technology

PhysicsConsult

Reimar Spohr

PostHeaderIcon Abstract

Ion transport through asymmetric nanopores prepared by ion track etching. Siwy, Z.; Apel, P.; Dobrev, D.; Neumann, R.; Spohr, R.; Trautmann, C.; Voss, K.. Nuclear Instruments & Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms (2003), 208, 143-148

Transport properties of single asym. nanopores in polyethylene terephthalate (PET) and polyimide (Kapton) membranes are investigated. The pores are produced by the track-etching technique based on irradn. of the polymer with heavy ions and subsequent chem. etching. Electrolytic cond. measurements show that asym. pores in both polymeric materials rectify the ionic current. The PET and Kapton pores differ however significantly in their transient transport properties. The ion current through the PET nanopore fluctuates with the amplitudes reaching even 100% of the mean current, whereas nanopores in Kapton exhibit a stable current signal. We show that the transient properties of the pores depend on the chem. structure of the polymer as well as on the irradn. and etching procedures used in this work.