Cu2O - TiO2 Nanocomposite: A Novel Material for Humidity Sensing.

Cu2O - TiO2 nanocomposites have been prepared through solid-state reaction route. Pellet consisting of samples of 2, 5, 10, 15, and 20 weight % of Cu2O in TiO2 are prepared. After annealing the samples at temperatures 200oC?500oC they were exposed to humidity in a chamber. Resistance of the pellets continuously decreased when relative humidity in the chamber was increased from 10% to 90%. The sample with 20% of Cu2O in TiO2 showed best results with sensitivity of 4.78M?/%RH for annealing temperature of 400oC. This sample manifests high reproducibility, less effect of aging and lower hysteresis for annealing temperature 400oC. The response and recovery time of this sample is found to be 76 and 296 s, respectively.