Abstract
In a recent paper [Mater. Res. Express (2019) 6 085312] El-Metwally et al studied the structural and optical properties of PVDF films doped with Li4Ti5O12 nanoparticles. The authors have used a wrong approach to calculate the reflectance spectra. The wrong obtained values of reflectance were used to calculate the refractive index. Consequently, other reported optical parameters in the commented paper that are calculated based on the refractive index such as optical conductivity, real and imaginary parts of the optical dielectric constant, the dispersion parameters evaluated from Wemple-DiDomenico single oscillator model, high-frequency dielectric constant, plasma oscillation frequency, linear optical susceptibility, third-order nonlinear optical susceptibility and the nonlinear refractive index are incorrect.
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