Abstract :
Nanocomposites are new materials important for several applications as humidity sensors, antibacterial etc.
So, to fabricate a humidity sensor as application will make perpetration anew kind of (Poly vinyl alcohol -
Carboxymethyl Cellulose –Copper Oxide) nanocomposites with different concentrations to test it’s for this purpose.
From the results we note that the dielectric constant, dielectric loss and AC. Electrical conductivity of (PVA-CMC)
blend increase with the increasing of the copper oxide nanoparticles concentrations at 100HZ. Whereas dielectric
constant and dielectric loss decrease with increased frequency but AC. Electrical conductivity increases with
increased frequency. The optical measurements are showed the absorbance of (PVA-CMC-Copper Oxide)
nanocomposites is increased with increase of the concentrations of copper oxide nanoparticles. The indirect energy
gap (Eg) of (PVA-CMC) blend decreases with the increase of the concentrations of copper oxide nanoparticles. All
the optical constants as absorption coefficient, extinction coefficient, and refractive index, real and imaginary
dielectric constants of nanocomposites are variation with the increase of the weight percentages of copper oxide
nanoparticles. Surface resistance of (PVA-CMC-Copper Oxide) nanocomposites variation with increase relative
humidity.
Keyword :
nanocomposites, AC. Electrical conductivity, copper oxide, humidity sensor, relative humidity.