Abstract: A sensor is provided with (i) a pair of electrically conducting electrodes on an electrically insulating substrate; (ii) a chemiresistor film in contact with the pair of electrodes, with an impedance that changes in the presence of an ionic analyte; (iii) a gate electrode formed from an electrically conductive material; (iv) a potential generator configured to apply an electrical potential difference between the gate electrode and the chemiresistor film; (v) a controller to selectively control the potential generator to apply an electric potential to the gate electrode relative to the potential of the chemiresistor film; and (vi) a voltage power source adapted to apply a voltage signal between the pair of electrically conducting electrodes to enable measurement of the resistance of the chemiresistor film.

Abstract: A sensor is provided for measuring the presence or amount of an ionic analyte in an electrolyte solution.

Abstract: The present invention provides a chemiresistor-based sensor for measuring the presence or amount of analyte in an electrolyte solution; said chemiresistor comprising (i) a chemiresistor film wherein the impedance of said nanoparticle film changes in the presence of an analyte; and (ii) two electrically conducting electrodes in electrical contact with said nanoparticle film; wherein said electrically conducting electrodes are adapted to be connected to a device for measuring the impedance of said chemiresistor film under a voltage signal and wherein the impedance of the double layer capacitor formed by the two electrically conducting electrodes in the presence of the electrolyte solution, is larger than the impedance of the chemiresistor film either before or after exposure of the chemiresistor film to the analyte. A method of using said chemiresistor-based sensor to measure the presence or amount of analyte is also provided.

Abstract: The present invention provides a chemiresistor-based sensor for measuring the presence or amount of analyte in an electrolyte solution; said chemiresistor comprising (i) a chemiresistor film wherein the impedance of said nanoparticle film changes in the presence of an analyte; and (ii) two electrically conducting electrodes in electrical contact with said nanoparticle film; wherein said electrically conducting electrodes are adapted to be connected to a device for measuring the impedance of said chemiresistor film under a voltage signal and wherein the impedance of the double layer capacitor formed by the two electrically conducting electrodes in the presence of the electrolyte solution, is larger than the impedance of the chemiresistor film either before or after exposure of the chemiresistor film to the analyte. A method of using said chemiresistor-based sensor to measure the presence or amount of analyte is also provided.

Abstract: The present invention provides a chemiresistor-based sensor for measuring the presence or amount of analyte in an electrolyte solution; said chemiresistor comprising (i) a chemiresistor film wherein the impedance of said nanoparticle film changes in the presence of an analyte; and (ii) two electrically conducting electrodes in electrical contact with said nanoparticle film; wherein said electrically conducting electrodes are adapted to be connected to a device for measuring the impedance of said chemiresistor film under a voltage signal and wherein the impedance of the double layer capacitor formed by the two electrically conducting electrodes in the presence of the electrolyte solution, is larger than the impedance of the chemiresistor film either before or after exposure of the chemiresistor film to the analyte. A method of using said chemiresistor-based sensor to measure the presence or amount of analyte is also provided.