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Related Concept Videos

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...

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Updated: Jun 2, 2026

The Microfluidic Probe: Operation and Use for Localized Surface Processing
08:07

The Microfluidic Probe: Operation and Use for Localized Surface Processing

Published on: June 4, 2009

Microfluidic push-pull probe for scanning electrochemical microscopy.

Dmitry Momotenko1, Fernando Cortes-Salazar, Andreas Lesch

  • 1Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.

Analytical Chemistry
|May 14, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a microfluidic push-pull probe for scanning electrochemical microscopy (SECM). This innovative probe enables high-resolution surface analysis on dry or complex substrates, advancing electrochemical imaging capabilities.

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Scanning-probe Single-electron Capacitance Spectroscopy
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Last Updated: Jun 2, 2026

The Microfluidic Probe: Operation and Use for Localized Surface Processing
08:07

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Published on: June 4, 2009

Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
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Scanning-probe Single-electron Capacitance Spectroscopy
10:53

Scanning-probe Single-electron Capacitance Spectroscopy

Published on: July 30, 2013

Area of Science:

  • Electrochemistry
  • Microfluidics
  • Surface Science

Background:

  • Scanning electrochemical microscopy (SECM) typically requires liquid environments.
  • Analyzing dry or complex substrates with high spatial resolution is challenging.
  • Existing SECM probes have limitations in microenvironment analysis.

Purpose of the Study:

  • To develop a novel microfluidic push-pull probe for SECM.
  • To enable SECM measurements on initially dry substrates and in microenvironments.
  • To achieve high spatial resolution surface characterization.

Main Methods:

  • Fabrication of a microfluidic probe with a working microelectrode, counter/reference electrode, and push-pull channels.
  • Utilizing a permanently renewed redox mediator droplet at the probe tip.
  • Employing a contact regime for SECM imaging.
  • Performing finite element computations for probe optimization.

Main Results:

  • Demonstrated proof-of-concept for the push-pull probe in SECM.
  • Achieved high spatial resolution imaging of gold-on-glass samples.
  • Successfully characterized local surface activity on vertically oriented substrates.
  • Finite element analysis guided sensitivity improvements.

Conclusions:

  • The microfluidic push-pull probe is effective for local surface activity characterization.
  • This technology expands SECM applications to dry and microenvironmental conditions.
  • The probe offers high spatial resolution for diverse substrate analyses.