Miniaturized Paper Based Sensor With Reduced Graphene Oxide as Interdigitated Electrodes for Multiple Applications

A paper-based miniaturized sensor, with redu- ced graphene oxide (rGO) as an active electrode, has been realized. Using this device, multiple applications, like temperature, breath, blow, and touch sensing, were demonstrated. The sensor showed good sensitivity as well as accuracy. Whatman filter paper of grade-1 was used as a substrate for laser ablation, to form rGO on it in the interdigitated electrode (IDE) format. Subsequently, physico-chemical characterizations of the material with various characterization techniques were carried out. The sensor gives a sensitivity of 1.46% $^{\circ }\text{C}^{-{1}}$ and the linearity ( ${R}^{{2}}$ = 0.993) with a resolution of 1 °C between the temperature range of 25 °C–60 °C showing the negative temperature coefficient (NTC) of 0.0016 $^{\circ }\text{C}^{-{1}}$ . Further, the sensor has been for breath, blow, and touch-sensing applications.