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Effect of Electrolyte Concentration and Pore Size on Ion Current Rectification Inversion
Dominik Duleba1, Pallavi Dutta1, Shekemi Denuga1
1School of Chemistry, University College Dublin, Belfield, Dublin 4 D04 V1W8, Ireland.
ACS Measurement Science Au
|June 21, 2022
Summary
Nanopore sensor performance depends on ion concentration and pore size. Lowering electrolyte concentration initially boosts ion current rectification, but further decreases cause inversion, a phenomenon influenced by pore dimensions and ion distribution.
Area of Science:
- Nanotechnology
- Physical Chemistry
- Materials Science
Background:
- Understanding nanoscale transport properties is crucial for advancing nanopore sensors.
- Electrical double layers (EDLs) and nanopore dimensions significantly influence transport characteristics.
Purpose of the Study:
- To investigate the impact of electrolyte concentration and nanopore size on ion current rectification in conical nanopores.
- To elucidate the relationship between EDL thickness, EDL overlap, and ion current rectification behavior.
Main Methods:
- Experimental measurements of ion current rectification.
- Numerical simulations of ion transport within nanopores.
- Systematic variation of electrolyte concentration and nanopore dimensions.
Main Results:
- Ion current rectification ratio initially increases with decreasing electrolyte concentration, reaches a maximum, then decreases and inverts below unity.
- Smaller nanopore sizes shift the concentration-dependent rectification maximum and inversion to higher electrolyte concentrations.
- Numerical results indicate that shifting ion enrichment distributions within the nanopore drive these observed phenomena.
Conclusions:
- Electrolyte concentration and nanopore size are critical parameters for controlling ion current rectification in nanopore devices.
- The interplay between EDL effects and pore geometry dictates rectification behavior, offering a pathway for sensor optimization.
- Precise control over ion distribution is key to tailoring nanopore sensor performance for specific applications.
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