Modeling the conductance and DNA blockade of solid-state nanopores

Stefan W. Kowalczyk, Alexander Y. Grosberg, Yitzhak Rabin, Cees Dekker

Research output: Contribution to journalArticlepeer-review

375 Scopus citations

Abstract

We present measurements and theoretical modeling of the ionic conductance G of solid-state nanopores with 5-100nm diameters, with and without DNA inserted into the pore. First, we show that it is essential to include access resistance to describe the conductance, in particular for larger pore diameters. We then present an exact solution for G of an hourglass-shaped pore, which agrees very well with our measurements without any adjustable parameters, and which is an improvement over the cylindrical approximation. Subsequently we discuss the conductance blockade ΔG due to the insertion of a DNA molecule into the pore, which we study experimentally as a function of pore diameter. We find that ΔG decreases with pore diameter, contrary to the predictions of earlier models that forecasted a constant ΔG. We compare three models for ΔG, all of which provide good agreement with our experimental data.

Original languageEnglish
Article number315101
JournalNanotechnology
Volume22
Issue number31
DOIs
StatePublished - 5 Aug 2011

Funding

FundersFunder number
Seventh Framework Programme201418, 247072

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