Working electrode for electrochemical enzymatic sensor systems

• US 5,552,027 A
• Filed: 07/18/1995
• Issued: 09/03/1996
• Est. Priority Date: 09/22/1993
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Kammermaier, deceased, Johann, Schulte, Rolf, Birkle, Siegfried
• Primary Examiner(s): Bell, Bruce F.
• Application Number:
  US08/503,563
• Time in Patent Office: 413 Days
• Field of Search: 437/101, 437/102, 437/103, 437/225, 437/228-233, 427/450, 427/528, 427/569, 427/249, 427/255, 427/255.1, 427/255.2, 427/327, 427/330, 427/419.1, 427/419.2, 148/DIG. 1, 148/240, 148/281, 204/290 F, 204/403, 204/400, 204/192.1, 204/192.12, 204/192.16
• US Class Current: 204/403.14
• CPC Class Codes: C12Q 1/001 Enzyme electrodes

Abstract

A working electrode or an electrochemical-enzymatic sensor system has a metallic base body which is provided with a thin layer of amorphous hydrogenated carbon (a-C:H).

Claims

1. A working electrode for an electrochemical-enzymatic sensor system, comprising a base body of titanium, zirconium, molybdenum, tungsten or electrically conductive silicon, the base body having a thin layer consisting essentially of amorphous hydrogenated carbon (a-C:

H).

2. The working electrode according to claim 1 wherein the a-C:

H layer has a thickness of <

5 μ

m.

3. The working electrode according to claim 2 wherein the metallic base body consists of titanium.

4. The working electrode according to claim 3 wherein the a-C:

H layer contains metal clusters.

5. The working electrode according to claim 2 wherein the a-C:

H layer contains metal clusters.

6. The working electrode according to claim 1 wherein the metallic base body consists of titanium.

7. The working electrode according to claim 6 wherein the a-C:

H layer contains metal clusters.

8. The working electrode according to claim 1 wherein the a-C:

H layer contains metal clusters.

9. The working electrode according to claim 8 wherein the metal clusters are clusters of gold or titanium.

10. A method of producing a working electrode for an electrochemical-enzymatic sensor system, comprising the step of depositing a thin layer consisting essentially of amorphous hydrogenated carbon (a-C:

H) on a base body of titanium, zirconium, molybdenum, tungsten or electrically conductive silicon, by low-pressure, high-frequency plasma deposition of a gaseous hydrocarbon.

11. The method according to claim 10 wherein the plasma deposition takes place at a pressure of 1 to 100 Pa.

12. The method according to claim 11 wherein the high-frequency power density in the plasma is 0.1 to 10 W.cm^-3 .

13. The method according to claim 11 wherein the plasma deposition takes place with a DC self-bias voltage of up to 1100V.

14. The method according to claim 10 wherein the high-frequency power density in the plasma is 0.1 to 10 W.cm^-3.

15. The method according to claim 14 wherein the plasma deposition takes place with a DC self-bias voltage of up to 1100V.

16. The method according to claim 10 wherein the plasma deposition takes place with a DC self-bias voltage of up to 1100V.

17. The method according to claim 10 wherein the hydrocarbon used is methane.

18. The method according to claim 10 wherein metal clusters are incorporated in the a-C:

H layer.