The tip carries a flat 99.999% pure gold disk, where the reaction takes place. Its ability to form self-assembled monolayers (SAMs) with thiol compounds makes gold a frequent choice for biosensors and modified electrodes. It shows no hydrogen adsorption wave and works over a wider negative range than platinum; its positive limit is set by surface oxidation.

In this L-shaped model the gold disk sits on the end face of the PTFE body's perpendicular head, so it faces sideways. This suits in-situ Raman cells, where the disk must be close to the window, and photoelectrochemistry, where it faces the light. Disk diameters: Ø0.5–6 mm. PTFE is inert to nearly all chemicals but soft; handle with care. Other shapes and bodies are on separate pages.

Key Features

L-shaped body: the disk is on the end face of a short perpendicular head; the surface faces sideways, 90° to the body axis
99.999% pure gold disk
PTFE body: inert to nearly all acids, bases and solvents; as a soft material (Shore D ≈ 55) it needs care against scratches and dents
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	L-shaped; disk on the end face of a short perpendicular head (faces sideways, 90° to the body)
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
Photoelectrochemistry setups: the disk surface can be turned toward the light source
Cells with an optical window such as in-situ Raman cells: the disk faces the window and sits close to it
Biosensor and electrochemical sensor development
Electrochemical detection of thiol compounds