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Current-voltage characteristics influenced by nanochannel diameter and surface charge density in a fluidic field-effect-transistor

Abstract

Nanochannel diameter and surface charge density have significant impact on current-voltage characteristics in a nanofluidic transistor. We have simulated the effect of channel diameter and surface charge density on current-voltage characteristics in a fluidic nanochannel with positive surface charge on its walls and a gate electrode on its surface. Anions depletion/enrichment leads to decrease/increase in ion current with gate potential. Ion current tends to increase linearly with gate potential for narrow channels at high surface charge densities and narrow channels are more effective to control ion current at high surface charge densities. The current-voltage characteristics are highly nonlinear for wide channels at low surface charge densities and it shows different regions of current change with gate potential. The ion current decreases with gate potential after attaining a peak value for wide channels at low values of surface charge densities. At low surface charge densities, ion current can be controlled by a narrow range of gate potentials for wide channels. The current change with source drain voltage shows ohmic, limiting and overlimiting regions.

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Publication details

The article was received on 15 Apr 2017, accepted on 19 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7CP02457F
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Current-voltage characteristics influenced by nanochannel diameter and surface charge density in a fluidic field-effect-transistor

    K. Singh and C. Guo, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02457F

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