Abstract
Bipolar nanofluidic diode is based on nanopore with positive and negative surface charges separated by a junction. This paper investigates the effects of the pore structure, taking the bullet-like pore as an example, on the ion current rectification. The Poisson-Nernst-Planck Modelings show that the ion current rectification behavior can be greatly influenced by the shape of the pore. The bipolar nanofluidic diode with more tapered tip has significantly higher ion current rectification degree. The modelling results indicate that special design of the nanopore is necessary for the performance of the bipolar nanofluidic diode.
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