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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...

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Related Experiment Video

Updated: Jun 25, 2026

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

Multilayered semiconductor membranes for nanopore ionic conductance modulation.

Maria E Gracheva1, Dmitriy V Melnikov, Jean-Pierre Leburton

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. gracheva@clarkson.edu

ACS Nano
|February 12, 2009
PubMed
Summary
This summary is machine-generated.

Semiconductor membranes offer electrical control over ion flow in nanopores, acting as tunable ionic transistors. Layered membranes provide advanced functions like rectification, filtering, and bidirectional switching for precise ion current management.

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Last Updated: Jun 25, 2026

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Nanopores are crucial for sensing and separation applications.
  • Controlling ion current through nanopores is essential for device functionality.
  • Semiconductor materials offer tunable electronic properties.

Purpose of the Study:

  • To investigate the use of thin layered semiconductor membranes for electrical control of ion current.
  • To explore the potential of these membranes as tunable ionic transistors.
  • To characterize the ion transport properties of single, double, and triple layered membranes.

Main Methods:

  • Fabrication of thin layered semiconductor membranes with nanopores.
  • Electrical characterization of ion current flow through the nanopores.
  • Voltage tuning of membrane properties to control ion transport.

Main Results:

  • Single layer membranes function as voltage-tunable ionic filters or switches.
  • Double layer membranes exhibit ion current rectification and filtering.
  • Triple layer membranes demonstrate enhanced functionality including bidirectional current blocking and switching.

Conclusions:

  • Thin layered semiconductor membranes can effectively control ion current flow through nanopores.
  • These membranes can be engineered to function as tunable ionic transistors with advanced capabilities.
  • The number of layers in the semiconductor membrane dictates the complexity of ion transport control achievable.