The tip carries a flat 99.999% pure gold disk, where the reaction takes place. A gold surface forms ordered monolayers (SAMs) with thiol-containing molecules, and this is why it is used for surface modification, biosensors and thiol detection. Compared with platinum it has no hydrogen adsorption wave and a wider working range in the negative direction; in the positive direction, surface oxidation sets the limit.

This version has a T-shaped PTFE body: the lower part is a wider cylinder, with the gold disk on its end face. The T type is chosen to fit the body size required by specific cells or holders. Disk diameters: Ø0.5–6 mm. PTFE is inert to nearly all chemicals but soft. Straight, L-shaped and PEEK T-type versions are separate products.

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
99.999% pure gold disk
T-shaped body: the lower section of the straight body is a wider cylinder; the disk sits on its end face
Suitable surface for thiol-based SAMs; no hydrogen adsorption wave, wider negative range than platinum
Surface renewed by polishing with 1 µm diamond, then 0.05 µm alumina
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
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	T-shaped; lower body section is a wider cylinder, disk on its end face
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
Voltammetry and impedance measurements in cells and holders designed for the T-shaped body
Biosensor and electrochemical sensor development
Electrochemical detection of thiol compounds