High performance humidity sensor and photodetector based on SnSe nanorods

Tin selenide (SnSe) nanorods were synthesized using a one-step solvothermal route and their humidity sensing and photodetection performance at room temperature were investigated. The results depict that SnSe nanorod-based humidity and photosensors have good long-term stability, are highly sensitive and have fast response and recovery times. In the case of the humidity sensor it was observed that the resistance of the films decreased with increasing relative humidity (RH). The humidity sensing behaviors were investigated in the range 11–97% RH at room temperature. A response time of ~68 s and recovery time of ~149 s were observed for the humidity sensor. The photosensing behavior showed typical response /recovery times of ~3 s with highly reproducible behavior.