The measuring surface of this electrode is a 99.999% pure gold disk embedded in an insulating body. 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 the L-shaped body the rod ends in a short perpendicular head; the gold disk is on its end face and faces sideways, 90° to the body. The disk can thus face, and sit close to, an optical window, a light source or the reference electrode. Disk diameters: Ø0.5–6 mm. The rigid PEEK body withstands mechanical stress. Straight, T-shaped and PTFE L-type versions are separate products.

Key Features

99.999% pure gold disk
L-shaped body: the disk is on the end face of a short perpendicular head; the surface faces sideways, 90° to the body axis
PEEK body: hard and rigid (Shore D ≈ 85) and resistant to creep under load; not for use with concentrated sulfuric or nitric acid
Disk diameter options Ø0.5, 1, 2, 3, 4, 5 and 6 mm
Suitable surface for thiol-based SAMs; no hydrogen adsorption wave, wider negative range than platinum
Body length 60 mm, total length ≈75 mm (manufacturer data); gold-plated contact pin at the tail
Surface renewed by polishing with 1 µm diamond, then 0.05 µm alumina

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	PEEK (polyether ether ketone)
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	Resistant to most aqueous and organic media; not compatible with concentrated sulfuric acid, concentrated nitric acid or halogen acids such as HF, HBr, HI
Operating temperature	Not specified for this product. One electrode maker recommends 10–80 °C for similar PEEK-body disk electrodes; extreme temperatures can damage the disk–body 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

Cells with an optical window such as in-situ Raman cells: the disk faces the window and sits close to it
Photoelectrochemistry setups: the disk surface can be turned toward the light source
Surface modification with thiol-based SAMs and preparation of modified electrodes
Biosensor and electrochemical sensor development
Electrochemical detection of thiol compounds
Setups where the electrode is frequently removed and refitted and the body is under mechanical stress