Controlling ion transport through nanopores: modeling transistor behavior

Mádai, Eszter and Matejczyk, Bartlomiej and Dallos, András and Valiskó, Mónika and Boda, Dezső (2018) Controlling ion transport through nanopores: modeling transistor behavior. PHYSICAL CHEMISTRY CHEMICAL PHYSICS. ISSN 1463-9076 (In Press)


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We present a modeling study of a nanopore-based transistor computed by a mean-field continuum theory (Poisson-Nernst-Planck, PNP) and a hybrid method including particle simulation (Local Equilibrium Monte Carlo, LEMC) that is able to take ionic correlations into account including finite size of ions. The model is composed of three regions along the pore axis with the left and right regions determining the ionic species that is the main charge carrier, and the central region tuning the concentration of that species and, thus, the current flowing through the nanopore. We consider a model of small dimensions with the pore radius comparable to the Debye-screening length (R_pore=lambda_D ~ 1), which, together with large surface charges provides a mechanism for creating depletion zones and, thus, controlling ionic current through the device. We report scaling behavior of the device as a function the R_pore=lambda_D parameter. Qualitative agreement between PNP and LEMC results indicates that mean-field electrostatic effects determine device behavior to the first order.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika > QC03 Heat. Thermodinamics / hőtan, termodinamika
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
Depositing User: Professor Dezső Boda
Date Deposited: 07 Sep 2018 11:46
Last Modified: 07 Sep 2018 11:46

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