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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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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.
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Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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Electrochemical Resistive-Pulse Sensing.

Rongrong Pan1,2, Keke Hu1,3, Dechen Jiang2

  • 1Department of Chemistry and Biochemistry , Queens College-CUNY , Flushing , New York 11367 , United States.

Journal of the American Chemical Society
|November 28, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces carbon nanopipettes (CNPs) for enhanced resistive-pulse sensing. This novel technique enables not only counting single nanoparticles but also analyzing their electroactive contents.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Analytical Chemistry

Background:

  • Resistive-pulse sensing using nanopores and nanopipettes is a common method for detecting single molecules and nanoparticles.
  • The signal is typically an ionic current change during particle translocation through a nanopipette orifice.

Purpose of the Study:

  • To develop a new resistive-pulse sensing technique using carbon nanopipettes (CNPs).
  • To demonstrate the capability of CNPs for both conventional and electrochemical sensing of single entities.
  • To show the potential for qualitative and quantitative analysis of electroactive materials within single entities.

Main Methods:

  • Utilized carbon nanopipettes (CNPs) for resistive-pulse sensing.
  • Measured electrochemical current generated by redox molecule oxidation/reduction at the carbon surface during particle translocation.
  • Employed liposomes as a model system to test sensing capabilities.

Main Results:

  • Successfully performed conventional resistive-pulse sensing of single liposomes using CNPs.
  • Demonstrated electrochemical resistive-pulse sensing, where current responds to electroactive species.
  • Achieved electrochemical identification and quantification of redox species (ferrocyanide, dopamine, nitrite) within single liposomes.

Conclusions:

  • Carbon nanopipettes offer a versatile platform for advanced single-entity analysis.
  • The electrochemical resistive-pulse technique enables detailed characterization of nanoparticle contents.
  • The small size of CNPs holds promise for in-situ single-entity measurements in biological systems.