Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-06-11
Physics
Condensed Matter
Other Condensed Matter
9 pages, 10 figures
Scientific paper
10.1103/PhysRevE.76.041202
We have investigated ion current rectification properties of a recently prepared bipolar nanofluidic diode. This device is based on a single conically shaped nanopore in a polymer film whose pore walls contain a sharp boundary between positively and negatively charged regions. A semi-quantitative model that employs Poisson and Nernst-Plank equations predicts current-voltage curves as well as ionic concentrations and electric potential distributions in this system. We show that under certain conditions the rectification degree, defined as a ratio of currents recorded at the same voltage but opposite polarities, can reach values of over a 1000 at a voltage range <-2 V, +2 V>. The role of thickness and position of the transition zone on the ion current rectification is discussed as well. We also show that rectification degree scales with the applied voltage.
Constantin Dragos
Siwy Z. S.
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