Systems and methods for measuring kinetic response of chemical sensor elements

A method for analyzing a gaseous mixture comprising:

• contacting a chemical sensor element comprising one or more discrete binding detectors with a gaseous mixture, each discrete binding detector comprising a graphene component;
• generating a series of excitation cycles over a time period, wherein each excitation cycle includes delivering a DC bias voltage to the graphene component at multiple discrete DC bias voltage values across a range of DC bias voltages;
• and
• measuring an electrical property of each of the discrete binding detectors resulting from the excitation cycles;
• determining the kinetics of a change in at least one of a measured electrical property value and a calculated value based on the measured electrical property over the time period;
• contacting the chemical sensor element with a gas other than a sample gas;
• and
• detecting a return of each of the discrete binding detectors back toward a baseline electrical property value.

A chemical sensing system comprising:

• a chemical sensor element comprising one or more discrete binding detectors, each discrete binding detector comprising a graphene component;
• a measurement circuit comprising an excitation voltage generator configured to generate a series of excitation cycles over a time period, wherein each excitation cycle includes delivering a DC bias voltage to the discrete binding detectors at multiple discrete DC bias voltage values across a range of DC bias voltages;
• and
• a capacitance sensor configured to measure capacitance of the discrete binding detectors resulting from the excitation cycles;
• and
• a controller circuit configured to determine a kinetic change in at least one of a measured capacitance value and a calculated value based on the measured capacitance over the time period.