Abstract
Transparent polyethylene terephthalate (PET) substrates were coated with SiO2 and ZrO2 using thermionic vacuum arc (TVA) method for the first time. The melting point of PET is approximately 260°C. Transmittances, thickness, reflectance, and refractive indices of coated PET samples were measured by ultraviolet—visible spectrophotometer and interferometry to characterize their optical properties. Additionally, scanning electron microscopy, energy dispersive X-ray spectroscopy, and atomic force microscopy were used to characterize the coated PET surface morphologies. Our results show that the SiO2- and ZrO2-coated PET samples had lower reflection when the TVA method was used; so, they show antireflective (AR) properties. Moreover, the coating homogeneity and surface roughness are proper for multi-layer AR coatings.
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