Study on High Performance Humidity Sensor of Sno2  In Situ Load Rgo

Abstract

Among all the environmental parameters, measuring humidity is particularly difficult. To this end, it is crucial to successfully screen out suitable sensing materials and design an appropriate material structure. A high-performance humidity sensor based on SnO 2  in situ load rGO has been demonstrated in this work. SnO 2  has a wide band gap, simple preparation process, low cost, good physical and chemical properties, and promising potential in the fabrication of sensors. Compared to a SnO 2  sensor, a SnO 2 /rGO humidity sensor has a higher response (4.23×10 7 %), shorter response/recovery time, smaller hysteresis (1.4 %), wider humidity range (11%–95%), and more types of hydrophilic functional groups, making it considerably advantageous. The SnO 2 /rGO humidity sensor also exhibits good linearity and long-term stability. The proposed sensor has good application prospects in high-sensitivity environmental monitoring and respiratory monitoring.

Keywords: Tin dioxide/rGO, Oxygen vacancy, Respiratory sensor, High sensitivity, Ionic conduction