Vapor sensor and materials therefor
First Claim
1. A conductometric sensor film for detecting one or more chemical analytes comprising:
- a polymer matrix comprising a crosslinked polymer and a plurality of conductive particles homogeneously distributed within said matrix;
wherein said crosslinked polymer comprises a siloxane monomer;
wherein said plurality comprises at least two distinct species of conductive particles, where a first species of said conductive particles comprises carbon black having an N2 adsorption of between about 8 to about 25 m2/g and a DBP of about 1 to about 180 ml/100 g, wherein the sensor film exhibits a change in resistance in the presence of the one or more chemical analytes.
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Accused Products
Abstract
The present disclosure 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 disclosure provides robust sensor film compositions that have low resistance, high conductivity, and greater temperature stability and sensitivity to chemical analytes, as well as methods of making these sensor films. Sensor film compositions according to the present disclosure include a matrix having a polymer resin comprising siloxane and a plurality of conductive particles including at least two distinct species.
50 Citations
22 Claims
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1. A conductometric sensor film for detecting one or more chemical analytes comprising:
a polymer matrix comprising a crosslinked polymer and a plurality of conductive particles homogeneously distributed within said matrix;
wherein said crosslinked polymer comprises a siloxane monomer;
wherein said plurality comprises at least two distinct species of conductive particles, where a first species of said conductive particles comprises carbon black having an N2 adsorption of between about 8 to about 25 m2/g and a DBP of about 1 to about 180 ml/100 g, wherein the sensor film exhibits a change in resistance in the presence of the one or more chemical analytes.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
a polymer matrix comprising a polymer and a plurality of conductive particles homogeneously distributed within said polymer;
wherein said polymer comprises a siloxane monomer having at least one hydrocarbon side group with greater than or equal to two carbon atoms; and
said plurality comprises at least two distinct species of conductive particles, wherein a first species of said conductive particles comprises carbon black, and wherein the sensor film exhibits a base resistance that is less than or equal to about 700 Ohms.- View Dependent Claims (18, 19, 20, 21)
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22. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
a polymer matrix comprising a polymer and a plurality of conductive particles homogeneously distributed within said polymer;
wherein said polymer comprises a siloxane monomer having at least one hydrocarbon side group with greater than or equal to two carbon atoms; and
said plurality comprises at least two distinct species of conductive particles, wherein a first species of said conductive particles comprises carbon black having an N2 adsorption of between about 8 to about 25 m2/g and a DBP of about 1 to about 180 ml/100 g, and a second species is selected from the group consisting of;
high conductivity carbon black, a conductive axial geometry particle comprising carbon, and particles comprising nickel, wherein the sensor film has a base resistance of less than or equal to about 700 Ohms and the sensor film exhibits a change in resistance in the presence of one or more chemical analytes.
Specification