Effect of UV irradiation on Optical Parameters of PVA-MoO3 Film
Keywords:
PVA; MoO3; UV irradiation; refractive index; dispersion energyAbstract
A sample of polyvinyl alcohol doped with 5% by weight of molybdenum oxide forming (PVA-MoO3) composite film was prepared using the solution casting technique. The film was exposed to UV irradiation (366nm wavelength) for different periods of time ranging from 5 to 60 min (5, 10, 20, 30, 40, 50 and 60 min) at room temperature. A computerized double beam UV-VIS spectrophotometer was used to characterize the sample film. Optical parameters such as (n) and (k) real and imaginary parts of refractive index, optical conductivity and dielectric constant were calculated. Also, the oscillator energy and dispersion energy (E0, Ed) were evaluated. The experimental results showed that the extinction coefficient (K), reflectance (R), refractive index (n), dispersion energy (Ed), real (ε1) and imaginary (ε2) parts of dielectric constants and optical conductivity (σop) are increased, where, the transmittance (T) and oscillator energy (E0) decreases with the increase of the exposure radiation time. Also, the results showed that (PVA-MoO3) composite film can be used as UV sensor.
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