Analysis of Structural, Optical and Electronic Properties of Polymeric Nanocomposites/Silicon Carbide for Humidity Sensors

The nanocomposites are really promising for industrial, environmental and medical applications. In this work, new types of nanocomposites have been prepared from (PVA-TiO2) nanocomposites doped by SiC nanoparticles for humidity sensor with high sensitivity, flexible, high corrosion resistance and low cost. The experimental and theoretical studies on structural and optical properties of (PVA-TiO2-SiC) nanocomposites have been investigated. The optical microscope and FTIR studies were examined. The optical properties of nanocomposites were examined in wavelength range (220-800)nm. The results showed that the optical absorbance of (PVA-TiO2) nanocomposites increases with increasing of the SiC nanoparticles concentrations. The energy band gap of (PVA-TiO2) nanocomposites decreases while the optical constants increase with the increase in SiC nanoparticles concentrations. The (PVA-TiO2-SiC) nanocomposites tested for humidity sensors at relative humidity range (40-80) RH.%. The experimental results showed that the electrical resistance for (PVA-TiO2-SiC) nanocomposites decreases with increase in relative humidity. The (PVA-TiO2-SiC) nanocomposites have highly sensitivity for relative humidity.