Impedimetric humidity sensor based on the use of SnO2 Co3O4 spheres
The article describes synthesis and sensing properties of SnO2 Co3O4 spheres composed of aggregated nanoparticles. Co3O4 was doped with pristine SnO2, and the resulting nanocomposite spheres were incorporated into a silicon adhesive. This material is shown to enable impedimetric sensing of relative humidity (RH) The impedance of the material decreases by 80% at a 1.0 kHz working frequency and by a factor of 2500 at 100 Hz. Capacitance increases by 70% at 1.0 kHz frequency and by a factor of 1509 at 100 Hz. The sensor works in the 10 90% RH range at temperatures from 10 to 80 degC. SnO2 Co3O4 based humidity sensor exhibited high sensitivity which makes it suitable material for the utilization in humidity meter.
Journal of Materials Science: Materials in Electronics