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 SnO2 in situ load rGO has been demonstrated in this work. SnO2 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 SnO2 sensor, a SnO2/rGO(1) humidity sensor has a higher response (3.84 × 105), 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 SnO2/rGO humidity sensor also exhibits good linearity. During the monitoring of the sensor for two months, the results show that the sensor has good stability, reliability and anti-aging effect. The proposed sensor has good application prospects in high-sensitivity environmental monitoring and respiratory monitoring.
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