Vapor sensor and materials therefor
First Claim
1. A conductometric sensor film comprising:
- a crosslinked siloxane polymer comprising a monomer having an alkyl hydrocarbon side group with greater than or equal to two carbon atoms; and
a plurality of conductive carbon black particles having a N2 adsorption of between about 8 to about 25 m2/g, distributed within said polymer, wherein the film exhibits a change in resistance when monomer interacts with one or more target analytes comprising one or more volatile organic hydrocarbon compounds.
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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.
55 Citations
22 Claims
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1. A conductometric sensor film comprising:
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a crosslinked siloxane polymer comprising a monomer having an alkyl hydrocarbon side group with greater than or equal to two carbon atoms; and a plurality of conductive carbon black particles having a N2 adsorption of between about 8 to about 25 m2/g, distributed within said polymer, wherein the film exhibits a change in resistance when monomer interacts with one or more target analytes comprising one or more volatile organic hydrocarbon compounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 18, 19)
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8. A sensor film composition for detecting chemical analytes comprising:
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a crosslinked polymer comprising a siloxane monomer having an alkyl hydrocarbon side group with greater than or equal to two carbon atoms; and a plurality of conductive particles distributed in said crosslinked polymer, wherein the film exhibits a change in resistance when said monomer interacts with one or more target analytes comprising one or more volatile organic hydrocarbon compounds. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21)
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22. A conductometric sensor probe comprising:
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a film; and at least one electrode in electrical communication with said film;
wherein said film comprises a crosslinked siloxane polymer comprising a monomer having an alkyl hydrocarbon side group with greater than or equal to two carbon atoms and a plurality of conductive particles distributed in said polymer to form a matrix, wherein said conductive particles have an N2 adsorption of between 8 to about 25 m2/g;
wherein said film exhibits a detectable change in resistance in the presence of one or more target analytes comprising one or more volatile organic hydrocarbon compounds.
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Specification