Surface plasmon resonance chemical electrode
US5858799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1996 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Oct 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This disclosure describes new methods and devices for sensing redox-active analytes in solution. The invention combines a surface plasmon resonance (SPR) sensor and a chemical electrode sensor. A conducting layer which supports SPR is attached to a voltage source. The voltage source is also connected to a reference electrode, which is in the aqueous solution with the SPR sensor. As the voltage is varied, the analytes undergo oxidation and reduction at the surface of the conducting film. The current is measured, just as it would be in a standard chemical electrode, with current peaks appearing at different potentials indicating different ions in the solution. Unlike a standard chemical electrode, the surface of the conducting film is also used to excite a surface plasmon wave (SPW). The SPW provides new information which is not available from any standard chemical electrode, such as the effective index of refraction at the surface of the conducting film as the analytes are being oxidized and/or reduced. This additional source of information can be used to minimize the effects of overlapping stripping peaks and interspecies compound formation as well as determine the thickness of sur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.