Robust low resistance vapor sensor materials
First Claim
1. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
- a polymer matrix comprising a cross-linked siloxane polymer and a plurality of particles including a conductive particle species comprising graphene that is homogeneously distributed within said matrix; and
wherein the low resistance conductometric sensor film exhibits a base resistance that is less than or equal to about 10 Ohm and the low resistance conductometric sensor film exhibits a change in resistance when said cross-linked siloxane polymer interacts with the one or more chemical analytes.
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Accused Products
Abstract
Compositions for sensor films used for detecting chemical analytes within sensors, such as polymer-absorption chemiresistors (i.e., conductometric sensors) are provided. Robust sensor film compositions that have low resistance, high conductivity, and greater temperature stability and sensitivity to chemical analytes are provided, as well as methods of making these sensor films. Such sensor film compositions include a matrix having a polymer resin and a plurality of conductive particles comprising an axial-geometry conductive particle. Exemplary axial-geometry conductive particles comprise graphene, such as a carbon nanotube. Blends of conductive particles are also contemplated, including blends of axial-geometry conductive particles, such as carbon nanotubes, and carbon black.
76 Citations
20 Claims
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1. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
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a polymer matrix comprising a cross-linked siloxane polymer and a plurality of particles including a conductive particle species comprising graphene that is homogeneously distributed within said matrix; and wherein the low resistance conductometric sensor film exhibits a base resistance that is less than or equal to about 10 Ohm and the low resistance conductometric sensor film exhibits a change in resistance when said cross-linked siloxane polymer interacts with the one or more chemical analytes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
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a polymer matrix comprising a cross-linked siloxane polymer and a plurality of electrically conductive particles homogeneously distributed within said matrix, wherein said plurality of electrically conductive particles comprises a first species selected from the group consisting of;
carbon nanotubes, nanofibers, nanofilaments, and combinations thereof, and a second species comprising carbon black; andwherein the low resistance conductometric sensor film exhibits a change in resistance when in the presence of the one or more chemical analytes, and wherein the low resistance conductometric sensor film exhibits a base resistance that is less than or equal to about 10 Ohm. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A low resistance conductometric sensor film for detecting one or more chemical analytes comprising:
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a polymer matrix comprising a cross-linked siloxane polymer and a plurality of particles including a conductive particle species comprising graphene that is homogeneously distributed within said matrix; and wherein the low resistance conductometric sensor film exhibits a base resistance that is less than or equal to about 100 mOhm and the low resistance conductometric sensor further exhibits a change in resistance when said cross-linked siloxane polymer interacts with the one or more chemical analytes. - View Dependent Claims (18, 19, 20)
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Specification