Effect of potassium chromate nanoparticles on the optical properties of poly (methyl methacrylate) (PMMA) films

In this work, the authors have presented a study on the variation in optical parameters that occur on doping Poly-methyl-metha crylate (PMMA) thin films with Potassium chromate (K2CrO4) by different weight percentages (1%,2%, 5% and 10%). These pure PMMA and its composite films are of thickness ∼100m and have been synthesized using the solution cast technique. The absorbance (A) and transmittance (T %) spectra of these films were recorded in the wavelength range (300-1100) nm using EI 2375 UV-VIS double beam spectrophotometer. From the obtained data, the optical parameters viz. absorption coefficient, extinction coefficient), finesse coefficient (F), refractive index (, real and imaginary parts of dielectric constant , optical conductivity and optical energy gap for indirect transition were evaluated and are found to show variation with increase of K2CrO4 concentration in the mentioned wavelength range.