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Multilayer Antireflective Composite Nanocoatings for Protective Glass in Optical Sensors
Vasil'kov M.Yu. 1,2, Kosobudskii I.D. 1,3, Ushakov N.M. 1,2
1Saratov Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Saratov, Russia
2Saratov State University, Saratov, Russia
3Yuri Gagarin State Technical University of Saratov, Saratov, Russia
Email: vasilk.mikhail@yandex.ru, nmu@bk.ru

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Multilayer mesoporous composite antireflective coatings SiO2@ZnO and SiO2@TiO2 for glass plates with different optical refractive indices (1.52 and 1.8) were developed using sol-gel technology. The resulting sols were applied to glass plates by dip-coating from a solution at 23±10 oC. The extraction rate from the solution was varied from 100 to 180 mm/min. Glass plates with coatings applied to both sides were dried at room temperature until a film formed and then heat-treated in a muffle furnace at 500 oC. During annealing, a composite composition of SiO2@ZnO and SiO2@TiO2 films was formed. The thickness of the SiO2 layer ranged from 100± 5 to 120±5 nm, depending on the experimental conditions. The composite layer thicknesses were: SiO2@ZnO 100±10 nm, SiO2@TiO2 to 140± 5 to 185±5 nm. The results of measuring the reflectance and transparency spectra of glass with single-, two-, and three-layer coatings made of sols with different compositions and drawing rates are presented. It is shown that two-layer mesoporous composite coatings with different compositions best demonstrate the antireflective properties of glass with medium (1.52) and high (1.8) refractive indices over a wide optical range of 400-1000 nm. Keywords: sol-gel technology, SiO2@ZnO(TiO2) composition, mesoporous antireflective coating, multilayer composite coating, protective glass.
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