Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

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.