Excellent humidity sensing properties of cadmium titanate nanofibers

Abstract We report humidity sensing characteristics of CdTiO 3 nanofibers prepared by electrospinning. The nanofibers were porous having an average diameter and length of ∼50–200 nm and ∼100 μm, respectively. The nanofiber humidity sensor was fabricated by defining aluminum electrodes using photolithography on top of the nanofibers deposited on glass substrate. The performance of the CdTiO 3 nanofiber humidity sensor was evaluated by AC electrical characterization from 40% to 90% relative humidity at 25 °C. The frequency of the AC signal was varied from 10 −1 to 10 6  Hz. Fast response time and recovery time of 4 s and 6 s were observed, respectively. The sensor was highly sensitive and exhibited a reversible response with small hysteresis of less than 7%. Long term stability of the sensor was confirmed during 30 day test. The excellent sensing characteristics prove that the CdTiO 3 nanofibers are potential candidate for use in high performance humidity sensors.