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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...

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Related Experiment Video

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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
09:43

Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

Published on: October 31, 2013

Mapping the ion current distribution in nanopore/electrode devices.

Agnieszka Rutkowska1, Joshua B Edel, Tim Albrecht

  • 1Department of Chemistry, Imperial College London, Exhbition Road, South Kensington Campus, London SW7 2AZ, UK.

ACS Nano
|December 14, 2012
PubMed
Summary
This summary is machine-generated.

Researchers analyzed current flow in three-electrode solid-state nanopore sensors. They discovered apparent current rectification due to cell current distribution, not pore geometry, aiding sensor design.

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Last Updated: May 16, 2026

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Molecular Electronics

Background:

  • Solid-state nanopores with integrated electrodes show promise for advanced biosensing and sequencing.
  • Existing designs include single-electrode "gated" nanopores and two-electrode transversal tunneling junctions.

Purpose of the Study:

  • To conduct a comprehensive analysis of current flow in a three-electrode nanopore device as a model system.
  • To investigate the origins of observed current rectification in such devices.
  • To provide insights for the rational design of nanopore-based sensor devices.

Main Methods:

  • Experimental analysis of current flow in a three-electrode solid-state nanopore device.
  • Comparison of experimental results with a recently developed theoretical model.
  • Benchmarking and definition of operational parameters for nanopore/electrode structures.

Main Results:

  • First comprehensive analysis of current flow in a three-electrode nanopore sensor model.
  • Observation of apparent current rectification not caused by pore geometry or electrostatics.
  • Identification of cell current distribution as the root cause of apparent rectification.
  • Validation of experimental findings against a theoretical model.

Conclusions:

  • Apparent rectification in three-electrode nanopore devices is an artifact of current distribution, not intrinsic pore properties.
  • The study provides a benchmark and defines operational parameters for nanopore/electrode sensor design.
  • Findings facilitate the rational engineering of next-generation single-molecule biosensors and sequencing technologies.