Vapor sensor and materials therefor
First Claim
1. A conductometric sensor film comprising:
- 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 carbon black particles having a N2 adsorption of between about 8 to about 25 m2/g, distributed within said polymer.
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Accused Products
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.
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Citations
32 Claims
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1. A conductometric sensor film comprising:
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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 carbon black particles having a N2 adsorption of between about 8 to about 25 m2/g, distributed within said polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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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 a hydrocarbon side group with greater than or equal to two carbon atoms; and
a plurality of conductive particles distributed in said crosslinked polymer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A sensor film composition for detecting chemical analytes comprising:
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a polymer comprising siloxane; and
a plurality of conductive particles having a N2 adsorption of between about 8 to about 25 m2/g;
wherein said conductive particles are distributed in said polymer. - View Dependent Claims (17, 18, 19, 20)
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21. A sensor film composition for detecting chemical analytes comprising:
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a crosslinked polymer comprising siloxane; and
an oil comprising a hydrocarbon side group substituted siloxane, wherein said hydrocarbon side group has greater than or equal to two carbon atoms, wherein said oil is distributed through said crosslinked polymer. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method of making a sensor film, the method comprising:
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a) admixing a polymer comprising a siloxane monomer having a hydrocarbon side group with greater than or equal to two carbon atoms, and a monomer having a functional group;
a plurality of conductive particles, a curing reagent; and
a catalyst;
b) mixing said polymer, said conductive particles, said curing reagent, and said catalyst to form a matrix mixture;
c) applying said matrix mixture on a sensor probe; and
d) crosslinking said matrix mixture. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification