The tip carries a flat 99.999% pure gold disk, where the reaction takes place. Unlike platinum, gold shows no hydrogen adsorption wave and offers a wider working range in the negative direction; in the positive direction it is limited by oxidation of its surface. Its main advantage is that it forms self-assembled monolayers (SAMs) with thiol compounds, which is why it is a frequent choice for modified electrodes and biosensors.

This model has a standard straight PTFE body, with the gold disk at the tip, in line with the rod. Disk diameters: Ø0.5–6 mm. PTFE is inert to nearly all acids, bases and solvents, so it also suits electrolytes that attack PEEK, like concentrated sulfuric acid. It is soft, so avoid scratching or denting it. PEEK, L- and T-type versions are on separate pages.

Key Features

PTFE body: inert to nearly all acids, bases and solvents; as a soft material (Shore D ≈ 55) it needs care against scratches and dents
Standard straight body: the disk sits on the end face, in line with the rod; the electrode is dipped vertically into the cell
99.999% pure gold disk
Suitable surface for thiol-based SAMs; no hydrogen adsorption wave, wider negative range than platinum
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
Surface renewed by polishing with 1 µm diamond, then 0.05 µm alumina
Body length 60 mm, total length ≈75 mm (manufacturer data); gold-plated contact pin at the tail

Technical Specifications

Electrode type	Gold disk working electrode
Electrode shape	Standard straight rod; disk on the end face, in line with the body axis
Body material	PTFE (polytetrafluoroethylene)
Disk material	Gold, 99.999%
Disk diameter	0.5, 1, 2, 3, 4, 5, 6 mm
Gold disk length	5 mm (manufacturer data)
Body / total length	60 mm / ≈75 mm (manufacturer data)
Connection	Gold-plated pin
Approx. potential window (vs. RHE)	0.1 M H₂SO₄: ≈ −0.10 to +1.33 V · 0.1 M NaOH: ≈ −0.14 to +1.29 V; positive limit set by surface oxidation
Polishing	1 µm diamond slurry on a nylon pad, then alumina on microcloth (final step 0.05 µm); rinse with pure water
Body chemical resistance	Inert to nearly all chemicals and solvents; attacked only by very reactive substances such as elemental alkali metals, elemental fluorine and chlorine trifluoride
Operating temperature	Not specified for this product. One electrode maker recommends 10–25 °C for similar PTFE-body disk electrodes; a body expanding with heat can break the seal

Available Options

Diameter	Description
0.5 mm	Ø0.5 mm gold disk
1 mm	Ø1 mm gold disk
2 mm	Ø2 mm gold disk
3 mm	Ø3 mm gold disk
4 mm	Ø4 mm gold disk
5 mm	Ø5 mm gold disk
6 mm	Ø6 mm gold disk

For sizes and specifications not listed above, you can request a custom quotation through the Quote Form.

Applications

Surface modification with thiol-based SAMs and preparation of modified electrodes
Measurements in strongly acidic electrolytes that damage PEEK, such as concentrated sulfuric acid
Routine voltammetry in standard three-electrode glass cells, with the electrode dipped vertically through the lid
Biosensor and electrochemical sensor development
Electrochemical detection of thiol compounds