Preparation of single-and double-layer antireflective coatings by sol-gel method
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Tarih
2020
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Antireflective (AR) SiO2coatings were developed in this work to increasethe transmittance of glass in the visible light range of 400-800nm, due to their potential applicationson solar energy systems. Also, double-layer AR coatings were preparedby covering AR SiO2layer with a dense TiO2layer with the aim of protecting AR layer from environmental effects. SiO2coatings were obtainedwith sol-gel and dip coating methods, by using acid-and base-catalyzed silica sols as precursors. Only 1% transmittance increase was gained with acid-catalyzed SiO2coating due to its dense structure. On the contrary, SiO2coatings formed by base-catalyzed sol havetransmittance >99% in the 460-660nm range and of 99.8% at 550nm, corresponding to the wavelength at maximum intensityof solar spectrum. This high valueswereattributed to the porous structure of the film revealed by SEM and AFManalysis, and to the optimized thicknessofcoating achievedat90-120mm/minwithdrawalspeeds. Transmittance of base-catalyzed SiO2coatings decreased to an average value of 96.2% after coated with high refractive index TiO2layer. However,still a 5-6% achievement in transmittanceof glass in 400-800nm range was attained by optimizing the thickness of each layer using different withdrawal speeds,and concentration and types of the precursor sols.Characterization of the coatings was performed with SEM, AFM, EDS and FTIR analysis
Açıklama
Anahtar Kelimeler
Kaynak
Research on Engineering Structures and Materials
WoS Q Değeri
Scopus Q Değeri
Cilt
6
Sayı
1
