Systems and methods for an atomic-thin two-dimensional material based portable gas sensor device

A processor-implemented method for determining food freshness, the method comprising:

• applying a constant current across an atomic-thin two-dimensional material of a portable sensor, wherein the atomic-thin two-dimensional material has a resistance;
• determining a compliance voltage across the atomic-thin two-dimensional material;
• sensing a change in compliance voltage based on exposing the atomic-thin two-dimensional material to a gas;
• converting the change in compliance voltage to a digital signal using an analog-to-digital (ADC) converter of the portable sensor;
• transmitting, by the transceiver, the digital signal to a remote device;
• determine if the digital signal represents a first value greater than a threshold value;
• determining an amount of the gas based on the determination that the digital signal represents a first value greater than a threshold value;
• and
• displaying the amount of the gas on a display of a remote device.

A system for determining food freshness, the system comprising:

• a plurality of portable gas sensors configured to sense a gas mixture, wherein each sensor of the plurality of portable gas sensors is located in a different geographical location and includes:
• an atomic-thin two-dimensional material configured to provide a sensed amount of a gas when exposed to a food sample;
• a transceiver configured to communicate the sensed amount of gas;
• and
• a display configured to display a freshness of the food sample, wherein each of the plurality of portable gas sensors are located at a different geographical location;
• a processor;
• and
• a memory, including instructions stored thereon, which, when executed by the processor, cause the system to:
• receive from at least one sensor of the plurality of portable gas sensors a sensed amount of gas;
• determine a food freshness based on the sensed amount of gas;
• cause the at least one sensor of the plurality of portable gas sensors to display the determined food freshness;
• and
• in a case where the food freshness is below a threshold value, provide an indication of which sensor of the plurality of portable gas sensors has the food freshness below the threshold value.