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Related Concept Videos

Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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.
The chosen potential ensures...
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...
Electrodes: Overview01:17

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...

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Updated: May 29, 2026

Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
05:28

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Published on: February 10, 2023

Gold-gold junction electrodes:the disconnection method.

Sara E C Dale1, Anne Vuorema, Ellen M Y Ashmore

  • 1Department of Chemistry, University of Bath, Bath BA2 7AY, UK.

Chemical Record (New York, N.Y.)
|September 8, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed novel gold-gold junction electrodes using electrodeposition for sensitive electroanalysis. These electrodes detect sub-micromolar hydroquinone and dopamine, offering potential for advanced analytical applications.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Electrodes are crucial for electroanalysis.
  • Developing novel electrode materials with high sensitivity is an ongoing challenge.
  • Gold electrodes offer excellent conductivity and stability.

Purpose of the Study:

  • To describe the formation of gold-gold junction electrodes.
  • To evaluate their application in electroanalytical detection.
  • To explore their potential uses and limitations.

Main Methods:

  • Electrodeposition from a non-cyanide gold plating bath.
  • Converging growth of hemispherical gold deposits on platinum microelectrodes.
  • Controlled etching in aqueous chloride solution to form sub-micron gaps.

Main Results:

  • Successfully formed gold-gold junctions with sub-micron gaps.
  • Demonstrated electroanalytical detection of sub-micromolar hydroquinone (Erev = 0.04 V vs. SCE).
  • Achieved electroanalytical detection of sub-micromolar dopamine (Erev = 0.14 V vs. SCE).

Conclusions:

  • Gold-gold junction electrodes are viable for sensitive electroanalysis.
  • The fabrication method allows for precise control over electrode gap size.
  • These electrodes show promise for detecting analytes at sub-micromolar concentrations.