Development of Low-Power and Environmentally Friendly Temperature Sensor Based on Gelatin-Graphene Nanocomposite*

An environmentally friendly temperature sensor has been fabricated by using a low-cost water-processable nanocomposite material based on gelatin and graphene. The device exhibits a temperature sensitivity of about −19mV/K and can detect ice formation at a few $\mu$A. Furthermore, a detailed model describing the charge carrier kinetics within the device under the current-controlled mode has been proposed. The sensor operates in a range between 260 and 310 K and is suitable for environmental monitoring due to its fast response, low power consumption, long-term stability and ease of disposal. A driving circuit has been designed to reduce the voltage drift and offset of the temperature sensor.