Structural, electrical and optical properties of (biopolymer blend/ titanium carbide) nanocomposites for low cost humidity sensors

摘要

Preparation of new nanocomposites and studying their structural, electrical and optical properties have been investigated for humidity sensors with low cost, lightweight, elastic and good sensitivity. The (PVA–CMC) blend was prepared with concentration of (50 wt%) polyvinyl alcohol and (50 wt%) carboxyl methyl cellulose. The influence of titanium carbide nanoparticles concentrations on the structural, electrical and optical properties of (PVA–CMC) blend has been studied. The results of electrical properties of (PVA–CMC–TiC) nanocomposites samples showed that the electrical conductivity of (PVA–CMC) blend increases with the increase of titanium carbide nanoparticles concentrations. The results of optical properties for (PVA–CMC–TiC) nanocomposites showed that the absorbance, absorption coefficient, extinction coefficient, refractive index, real, imaginary dielectric constants and optical conductivity of (PVA–CMC) blend increase with the increase of titanium carbide nanoparticles concentrations while the transmittance and energy band gap decrease with the increase of TiC nanoparticles concentrations. The results of (PVA–CMC–TiC) applications for humidity sensors showed that the (PVA–CMC–TiC) nanocomposites have highly sensitive for relative humidity.