Optical and structural properties of (In2O3 : ZnO : Au)‎ nanocomposite thin films prepared by spray pyrolysis method

Abstract EN

Indium Oxide (In2O3) and Zinc Oxide (ZnO) nanoparticles were mixed carefully with gold nanoparticles, which were synthesis, by turkevich method.

By using the method of spray pyrolysis different concentrations (5:5:0 ml, 5:4:1 ml, 5:3:2 ml, 5:2:3 ml, 5:1:4 ml and 5:0:5 ml) from these chemical compounds were used to preformed nanocomposite thin films of thickness of (250-300) nm.

The structural properties were studied for all nanocomposite thin film samples with different concentrations.

The existence of Miller indices conforms to (211), (222), (400), (333), (440) and (622) major lattice planes of the cubic spinel phase of In2O3 at 2θ =20.17, 33, 44.66, 50.95, 59.02, 72.48 and 73.12.

While secondary lattice planes of (100) and (002) of ZnO at 2θ = 31.5582 and 34.1617, also lattice planes of (111) and (200) of Au were found at 2θ = 38.5799 and 45.6016.

The work also extended to study the optical properties, which included the transmission spectrum, absorption spectrum, absorption coefficient, attenuation coefficient and estimation of optical energy gap for all samples.

The results of optical properties were clearly demonstrated that the increasing of gold concentration is decreasing the transmission, and decreasing the optical band gap from 3.10 to 3.05 eV, but increasing the absorption coefficient and attenuation coefficient.

Finally The real and imaginary part of dielectric constant of (In2O3:ZnO:Au) nanocomposite thin film with different concentrations decrease with increasing of frequency, and increases with gold nanoparticles increasing