Production method for noble metal electrodes
The invention relates to a method for producing a medical electrode, comprising the following steps: (i) providing a substrate; (ii) applying a composition onto the substrate, wherein the composition comprises (a) a non-aqueous solvent and (b) an organic iridium complex compound dissolved in the solvent; (iii) heating the composition, and thereby forming a noble metal layer on the substrate.
1. A method for producing a medical electrode coated with iridium oxide, comprising the following steps:
(i) providing a medical electrode having an electrode surface;
(ii) applying a liquid composition to the electrode surface, the composition comprising an organic iridium complex compound;
(iii) heating the composition in an oxygen-containing atmosphere, thereby forming an iridium oxide layer on the electrode surface, and
wherein the liquid composition comprises an iridium complex comprising diolefin and C6-C18 monocarboxylate ligands of type [LIr[O(CO)R1]] m , where L denotes a compound acting as a diolefin ligand, where —O(CO)R1 denotes a non-aromatic C6-C18 monocarboxylic acid radical, and where m is an integer ≥2.
2. The method according to claim 1 , wherein the solubility of the organic iridium complex compound in propylene glycol monopropyl ether at 25° C. and 1013 hPa is at least 1% by mass, based on the total mass of the composition.
3. The method according to claim 2 , wherein the solubility of the organic iridium complex compound in propylene glycol monopropyl ether at 25° C. and 1013 hPa is at least 10% by mass, based on the total mass of the composition.
4. The method according to claim 1 , wherein the liquid composition comprises a non-aqueous solvent.
5. The method according to claim 1 , wherein step (iii) is carried out above a decomposition temperature of the iridium complex compound but below a lowest melting or decomposition temperature of a material of the electrode surface.
6. The method according to claim 1 , wherein the electrode surface comprises a metal, a ceramic, or a plastic, or consists at least in sections of metal, ceramic, or plastic.
7. The method according to claim 1 , wherein the liquid composition is applied using a method selected from the group consisting of printing, dip coating, spray coating, spin coating, knife coating, and application by means of a saturated application tool.
8. The method according to claim 1 , wherein the heating, and thereby the formation of an iridium oxide layer, is carried out at a temperature of less than 1000° C.
9. The method according to claim 8 , wherein the heating, and thereby the formation of an iridium oxide layer, is carried out at a temperature of less than 150° C.
10. The method according to claim 1 , wherein the heating, and thereby the formation of an iridium oxide layer, is carried out at a pressure of between 750 and 1250 hPa.
11. The method according to claim 1 , wherein the application of the composition to the electrode surface takes place selectively in a shape of a predetermined pattern so that the formed iridium oxide layer is given the shape of the predetermined pattern.
12. The method according to claim 1 , wherein steps (ii) and (iii) are repeated once or several times in order to incrementally build up a thicker iridium oxide layer.
13. The method according to claim 1 , wherein L is cyclooctadiene or norbornadiene, n is 1 or 2, m is 2, and R1 is a non-aromatic C5-C17 hydrocarbon radical.
14. The method according to claim 1 , wherein the iridium oxide layer has a thickness of from 50 nm to 5 μm.
15. The method according to claim 14 , wherein the iridium oxide layer has a thickness of from 300 nm to 1 μm.