We present experimental measurements of electromigra-tion current through a single cylindrical nanopore. A single cylindrical nanopore with 175 nm diameter was fabricated in silicon in series with two micropores with 2 and 100 μm diameters. Thick electrical double layers (EDLs) (Ka ≈ 1) exhibit current rectification due to asymmetric concentration polarization while thinner EDLs show nearly symmetric conductance. After the electric field is turned off, electrical current is measured and observed due to redistribution of ions in the concentration polarization layer.
ASJC Scopus subject areas
- Analytical Chemistry