Therm-O-Disc, Incorporated

Praveen C Ramamurthy

Blase S Amadio

Edward John Blok

Prasad S Khadkikar

Bernd D Zimmermann

Jeffrey A West

Jared Starling

A single-use replaceable (one-shot) conductometric sensor film for use with a conductometric sensor, such as flammable vapor sensors, is provided that detects one or more volatile organic compound chemical analytes. Such sensor films exhibit a sustained change in resistance after exposure to the target analytes. The sensor film compositions undergo substantially inelastic deformation after a detection event and thus exhibit a sustained resistance change, ensuring only one-time use for certain applications. Methods of sensing analytes using the single-use sensor film compositions are also provided.

Single-use flammable vapor sensor films

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.

Robust low resistance vapor sensor materials

The present invention relates to methods of making compositions for sensor films used for detecting chemical analytes within sensors, such as polymer-absorption chemiresistors (i.e., conductometric sensors). The sensor films have reduced cross-sensitivity to temperature, while maintaining sensitivity to the chemical analytes. The sensor matrix includes components that are associated with a first temperature coefficient of resistance, such as a polymer resin and/or a first conductive particle. The sensor matrix further comprises a second species, preferably a conductive particle, which has a second temperature coefficient of resistance that is opposite to the first temperature coefficient of resistance. The second species has an opposite influence on a resistance response of the sensor from the first species. In this manner, the sensor matrix exhibits a minimized response in resistance to any changes in temperature.

Methods of minimizing temperature cross-sensitivity in vapor sensors and compositions therefor

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.

Vapor sensor and materials therefor

A sensor system for detecting the presence of a target analyte. The system comprises a first conductor, a second conductor, and a sensor film. The sensor film is positioned between the first conductor and the second conductor. The sensor film includes a crosslinked siloxane polymer comprising a monomer having a hydrocarbon side group. The sensor film has an absorptive affinity for the target analyte. The electrical capacitance of the sensor system changes upon absorption of the target analyte by the sensor film.

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Mansfield, OH, United States of America

Praveen C Ramamurthy