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Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

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...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...

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Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
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Feedback effects in combined fast-scan cyclic voltammetry-scanning electrochemical microscopy.

Daniel S Schrock1, David O Wipf, John E Baur

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.

Analytical Chemistry
|June 7, 2007
PubMed
Summary

Fast-scan cyclic voltammetry minimizes substrate interactions in scanning electrochemical microscopy. This allows for precise chemical imaging of surfaces and biological cells by controlling scan rates and tip-substrate distances.

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Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Surface Science

Background:

  • Scanning electrochemical microscopy (SECM) is a powerful technique for chemical imaging.
  • Tip-substrate interactions can perturb voltammetric signals, limiting imaging resolution and accuracy.
  • Understanding and controlling these interactions is crucial for advanced SECM applications.

Purpose of the Study:

  • To investigate the influence of scan rate and tip-substrate distance on diffusional interactions in SECM.
  • To determine conditions for minimizing feedback effects during voltammetric measurements.
  • To enable high-resolution chemical imaging of substrates, including biological samples.

Main Methods:

  • Fast-scan cyclic voltammetry (FSCV) was employed at scan rates from 5 to 1000 V/s.
  • Experiments were conducted with conducting and insulating substrates.
  • Tip-substrate distance was systematically varied.

Main Results:

  • Diffusional interactions were strongest at low scan rates and on the reverse sweep.
  • At scan rates of 1000 V/s, tip-substrate interactions were negligible even at 1 µm distance.
  • Accurate imaging of a 10 µm Pt electrode diffusion layer was achieved by minimizing feedback effects.
  • Tip-substrate interactions were significantly reduced or absent when imaging a biological cell at high scan rates.

Conclusions:

  • High scan rates in FSCV can effectively suppress tip-substrate diffusional interactions in SECM.
  • Optimized scan rates and tip-substrate distances allow for artifact-free chemical imaging.
  • This approach enhances the applicability of SECM for studying diverse substrates without feedback interference.