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Research Article

Preparation of single- and double-layer antireflective coatings by sol-gel method

Berrin İkizler

Department of Chemical Engineering, Ege University, Bornova, İzmir, Turkey                                                                                                                                                   

Keywords

Abstract



Antireflective glass; 

SiO2; 

TiO2; 

Double-layer coating; 

Thin films; 

Sol-gel method




Antireflective (AR) SiO2 coatings were developed in this work to increase the transmittance of glass in the visible light range of 400-800 nm, due to their potential applications on solar energy systems. Also, double-layer AR coatings were prepared by covering AR SiO2 layer with a dense TiO2 layer with the aim of protecting AR layer from environmental effects. SiO2 coatings were obtained with 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 SiO2 coating due to its dense structure. On the contrary, SiO2 coatings formed by base-catalyzed sol have transmittance > 99% in the 460-660 nm range and of 99.8% at 550 nm, corresponding to the wavelength at maximum intensity of solar spectrum. This high values were attributed to the porous structure of the film revealed by SEM and AFM analysis, and to the optimized thickness of coating achieved at 90-120 mm/min withdrawal speeds. Transmittance of base-catalyzed SiO2 coatings decreased to an average value of 96.2% after coated with high refractive index TiO2 layer. However, still a 5-6% achievement in transmittance of glass in 400-800 nm 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.

© 2019 MIM Research Group. All rights reserved.

LATEST News

20/08/2020 Collaboration for IMSTEC 2020: Editorial Board of our journal and Organizing Committee of the 5. International Conference on Material Science and Technology (IMSTEC 2020) have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.  


21/02/2020 Collaboration for SET 2020: Editorial Board of our journal and Organizing Committee of the 19th International Conference on Sustainable Energy Technologies (SET 2020) have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.


25/12/2019 Most Cited Paper Award: The paper authored by Manoj Sahni and Sanjeev Sharma entitled as “Elastic-plastic deformation of a thin rotating solid disk of exponentially varying density" is awarded the 2019 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM).

25/12/2019 Best Paper Award: The paper authored by Marcelo Mesquita do Amaral, Matheus Wanglon Ferreira and Mauro de Vasconcellos Real entitled as “A simplified method for analysis of reinforced concrete beams exposed to fire situation” is awarded the 2019 Best Paper Award of Research on Engineering Structures and Materials (RESM).


13/11/2019 Data articles as a new type of submision: Editorial Board of our journal have decided to accept a new type of submission: data articles. The focus of these papers is only on data and how it is collected but not on its interpretation and drawn conclusions. For more see News section.


(More details of the news may be given in the News section)


For more see News...

LATEST AWARDS


2019 Most Cited Paper Award:

The paper authored by Manoj Sahni and Sanjeev Sharma entitled as “Elastic-plastic deformation of a thin rotating solid disk of exponentially varying density" is awarded the


2019 Best Paper Award:

The paper authored by Marcelo Mesquita do Amaral, Matheus Wanglon Ferreira and Mauro de Vasconcellos Real entitled as “A simplified method for analysis of reinforced concrete beams exposed to fire situation” is awarded the 


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Last Update:

28.09.2020

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