Synthesis and Characterization of Polymer Blend-CoFe2O4 Nanoparticles as a Humidity Sensors for Different Temperatures

In this paper, preparation of [carboxyl methyl cellulose (CMC)–polyvinyl pyrrolidone (PVP)–cobalt iron oxides nanoparticles (CoFe2O4)] nanocomposites for humidity sensors at different temperatures have been investigated. The synthesized humidity sensors have low cost, lightweight, flexible, high corrosion resistance, high sensitivity compare with other sensors. The structural and optical properties of nanocomposites have been studied. The experimental results of optical properties showed that the absorbance, absorption coefficient of (CMC–PVP) blend increase while the transmittance and energy band gap decrease with increase in CoFe2O4 nanoparticles concentrations. The results of humidity sensors showed that the electrical resistance of (CMC–PVP–CoFe2O4) nanocomposites decreases with an increase in CoFe2O4 nanoparticles concentrations and temperature. The (CMC–PVP–CoFe2O4) nanocomposites have high sensitivity for humidity for different temperatures.