Vapor sensor and materials therefor
US7138090B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 2003 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Jun 16, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31663
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a composition for sensor films used for detecting chemical analytes within sensors, such as polymer-absorption chemiresistors (i.e. conductometric sensors). The present invention provides sensor film compositions that have greater temperature stability and sensitivity to chemical analytes, as well as methods of making these sensor films. Sensor film compositions according to the present invention include a crosslinked siloxane polymer comprising a monomer having a hydrocarbon side group with greater than or equal to two carbon atoms and a plurality of conductive particles distributed within the polymer. Alternate preferred embodiments distribute an oil comprising siloxane having at least one side group with greater than or equal to two carbons through a crosslinked siloxane polymer, wherein the oil is distributed through a crosslinked polysiloxane copolymer. Further, conductive particles having a N2 adsorption of between about 8 to about 25 m2/g provide enhanced sensor film performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.