Role of holmium on the humidity sensing properties of the CoCr2O4 ceramics for possible applications in humidity sensors

For the first time, innovative and remarkable humidity sensing properties of solvent combustion produced spinel cobalt chromite nanoparticles based microporous materials have been presented. These features were identified by solution combustion. To create a capacitive humidity sensor, microporous samples were initially created by sintering a green tape of cobalt chromite that had been manufactured via tape casting. To finish the process, the samples were sandwiched between two parallel silver electrodes. The newly developed sensors have good humidity sensing capabilities over a wide range of relative humidity (RH), from 11 to 97%, with a detectable gain of 3 pF/%RH. Because of the significant rise in dielectric constant, the sensing properties can be attributed to the dielectric polarisation of moisture molecules that are absorbed on the surface of the CoCr2O4 material and then condensed in the surface pores. A variety of complicated tests have been performed in order to get a knowledge of its physicochemical properties. These investigations resulted in the sensor's remarkable moisture detection abilities.

Role of holmium on the humidity sensing properties of the CoCr2O4 ceramics for possible applications in humidity sensors Articles