Gold Microelectrode (10 µm, 25 µm, 50 µm, 100 µm, 200 µm)

Overview

A gold microelectrode is a disk working electrode with a micrometre-scale diameter, designed to deliver high mass-transport efficiency and stable electrochemical signals at very low currents. Compared with macroelectrodes, microelectrodes rapidly establish convergent (near-hemispherical) diffusion, enabling steady-state or quasi–steady-state voltammetry, reduced capacitive background, and improved performance in low-conductivity media.

Construction & working principle

Typical designs use a fine gold wire sealed inside an insulating body (commonly glass), with the end face polished to a mirror-finish disk. Electrical contact is provided via a robust connector pin, and the small active area drives pA–nA currents that reduce iR drop and minimise double-layer charging artefacts—ideal for fast scans, kinetic studies, and trace-level electroanalysis.

Sizes of gold microelectrodes available

ScienceGears can support common research diameters, including:

• 10 µm – ultra-low current work, fast kinetics, small-volume cells
• 25 µm – general-purpose microvoltammetry, sensing R&D
• 50 µm – robust handling with strong steady-state behaviour
• 100 µm – higher signal while retaining microelectrode advantages
• 200 µm – higher current microdisk regime; great for teaching and screening

(Other diameters and formats may be available on request, depending on supplier and electrode style.)

Compatibility

Gold microelectrodes are compatible with most potentiostats (including EIS-capable systems), standard three-electrode cells, Faraday cages, and microvolume electrochemical cells. They are widely used with mainstream research platforms from Metrohm, Gamry Instruments, and BASi, and can complement electrode accessories from Ionode.

Typical applications

• Mechanistic voltammetry (fast electron transfer, coupled chemistry)
• Biosensing and thiol/SAM-functionalised gold surfaces
• Corrosion and inhibitor screening in low ionic strength electrolytes
• SECM/UME method development and micro-scale kinetic measurements

Choosing ScienceGears means you can source the microelectrode alongside matched potentiostats, electrochemical cells, polishing consumables, and measurement workflows—ensuring a compatible, research-ready setup.