Low temperature sol-gel synthesis and humidity sensing properties of Cr2−xTixO3

The low temperature sol-gel synthesis of chromium titanate (CTO) is reported. Crystalline CTO powders have been obtained at temperature as low as 400 °C. CTO thin films deposited by LPD on alumina substrates were tested regarding their humidity sensing properties. They were found sensitive to water vapor at room temperature showing fast response time. The humidity sensing mechanism on these thin films has been investigated and discussed on the basis of the film porosity and water–CTO surface interaction.