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Polarization of gold in nanopores leads to ion current rectification

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1];  [1];  [2];  [1]
  1. Univ. of California, Irvine, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Biomimetic nanopores with rectifying properties are relevant components of ionic switches, ionic circuits, and biological sensors. Rectification indicates that currents for voltages of one polarity are higher than currents for voltages of the opposite polarity. Ion current rectification requires the presence of surface charges on the pore walls, achieved either by the attachment of charged groups or in multielectrode systems by applying voltage to integrated gate electrodes. Here we present a simpler concept for introducing surface charges via polarization of a thin layer of Au present at one entrance of a silicon nitride nanopore. In an electric field applied by two electrodes placed in bulk solution on both sides of the membrane, the Au layer polarizes such that excess positive charge locally concentrates at one end and negative charge concentrates at the other end. Consequently, a junction is formed between zones with enhanced anion and cation concentrations in the solution adjacent to the Au layer. This bipolar double layer together with enhanced cation concentration in a negatively charged silicon nitride nanopore leads to voltage-controlled surface-charge patterns and ion current rectification. The experimental findings are supported by numerical modeling that confirm modulation of ionic concentrations by the Au layer and ion current rectification even in low-aspect ratio nanopores. Lastly, our findings enable a new strategy for creating ionic circuits with diodes and transistors.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
ORNL LDRD Director's R&D; USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1344289
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 20 Vol. 7; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Direct electrochemical observation of glucosidase activity in isolated single lysosomes from a living cell journal April 2018
Dynamic Curvature Nanochannel‐Based Membrane with Anomalous Ionic Transport Behaviors and Reversible Rectification Switch journal January 2019
A review: applications of ion transport in micro‐nanofluidic systems based on ion concentration polarization journal December 2019
A novel design of nanochannel structure in a micro–nanofluidic preconcentrator for electrokinetic ion enrichment journal December 2019
A simple strategy for the fabrication of gold-modified single nanopores and its application for miRNA sensing journal January 2019
Induced-Charge Enhancement of the Diffusion Potential in Membranes with Polarizable Nanopores journal November 2017

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