Production of Nanoporous Films on Glass Surfaces with Antireflective Properties and Determination of Their Scratch Resistances

Project no. 24025 · Status: Kapanmış (Yayın bekleniyor) · 2023

Summary

<p>This&nbsp;project&nbsp;aimed&nbsp;to&nbsp;develop&nbsp;coatings&nbsp;for&nbsp;use&nbsp;in&nbsp;solar&nbsp;energy&nbsp;systems&nbsp;that&nbsp;exhibit&nbsp;high&nbsp;light&nbsp;transmittance&nbsp;over&nbsp;a&nbsp;broad&nbsp;wavelength&nbsp;range&nbsp;while&nbsp;simultaneously&nbsp;providing&nbsp;scratch&nbsp;resistance.&nbsp;Within&nbsp;this&nbsp;scope,&nbsp;antireflective&nbsp;SiO₂&nbsp;thin&nbsp;films&nbsp;were&nbsp;coated&nbsp;onto&nbsp;glass&nbsp;substrates,&nbsp;and&nbsp;an&nbsp;optimized&nbsp;TiO₂&nbsp;thin&nbsp;film&nbsp;was&nbsp;applied&nbsp;as&nbsp;the&nbsp;top&nbsp;layer&nbsp;to&nbsp;improve&nbsp;the&nbsp;scratch&nbsp;resistance&nbsp;of&nbsp;the&nbsp;coatings.&nbsp;All&nbsp;thin&nbsp;films&nbsp;were&nbsp;fabricated&nbsp;using&nbsp;the&nbsp;sol-gel&nbsp;and&nbsp;dip-coating&nbsp;methods.&nbsp;To&nbsp;enhance&nbsp;light&nbsp;transmittance,&nbsp;various&nbsp;surfactants&nbsp;(Tween20,&nbsp;Tween80,&nbsp;SDS)&nbsp;and&nbsp;polymers&nbsp;(PEG300,&nbsp;PEG400,&nbsp;PEG1500,&nbsp;PEG6000,&nbsp;Pluronic&nbsp;F-127)&nbsp;were&nbsp;added&nbsp;to&nbsp;the&nbsp;coating&nbsp;solutions,&nbsp;and&nbsp;porous&nbsp;antireflective&nbsp;coatings&nbsp;were&nbsp;obtained&nbsp;after&nbsp;the&nbsp;calcination&nbsp;process.</p><p>Within&nbsp;the&nbsp;optimization&nbsp;of&nbsp;single-layer&nbsp;SiO₂&nbsp;and&nbsp;TiO₂&nbsp;films,&nbsp;the&nbsp;effects&nbsp;of&nbsp;production&nbsp;parameters,&nbsp;including&nbsp;silica/titanium&nbsp;concentration,&nbsp;additive&nbsp;type,&nbsp;additive&nbsp;concentration,&nbsp;and&nbsp;withdrawal&nbsp;speed,&nbsp;on&nbsp;the&nbsp;optical&nbsp;properties&nbsp;of&nbsp;the&nbsp;coatings&nbsp;were&nbsp;systematically&nbsp;investigated.&nbsp;The&nbsp;optimum&nbsp;production&nbsp;conditions&nbsp;obtained&nbsp;were&nbsp;subsequently&nbsp;used&nbsp;for&nbsp;the&nbsp;preparation&nbsp;of&nbsp;multilayer&nbsp;coatings.&nbsp;In&nbsp;the&nbsp;second&nbsp;stage&nbsp;of&nbsp;the&nbsp;study,&nbsp;multilayer&nbsp;SiO₂&nbsp;coatings&nbsp;were&nbsp;developed&nbsp;by&nbsp;increasing&nbsp;the&nbsp;degree&nbsp;of&nbsp;porosity&nbsp;in&nbsp;each&nbsp;layer.&nbsp;In&nbsp;the&nbsp;final&nbsp;stage,&nbsp;these&nbsp;coatings&nbsp;were&nbsp;covered&nbsp;with&nbsp;an&nbsp;optimized&nbsp;TiO₂&nbsp;top&nbsp;layer.&nbsp;The&nbsp;optical&nbsp;performances&nbsp;of&nbsp;the&nbsp;developed&nbsp;coatings&nbsp;were&nbsp;evaluated&nbsp;by&nbsp;transmittance&nbsp;and&nbsp;reflectance&nbsp;measurements&nbsp;performed&nbsp;over&nbsp;the&nbsp;wavelength&nbsp;range&nbsp;of&nbsp;300–1400&nbsp;nm,&nbsp;while&nbsp;their&nbsp;mechanical&nbsp;durability&nbsp;was&nbsp;assessed&nbsp;using&nbsp;the&nbsp;pencil&nbsp;hardness&nbsp;test.&nbsp;The&nbsp;chemical&nbsp;structure&nbsp;and&nbsp;morphology&nbsp;were&nbsp;further&nbsp;characterized&nbsp;by&nbsp;FTIR&nbsp;and&nbsp;AFM&nbsp;analyses.</p><p>Multilayer&nbsp;SiO₂&nbsp;coatings&nbsp;exhibited&nbsp;an&nbsp;average&nbsp;light&nbsp;transmittance&nbsp;of&nbsp;approximately&nbsp;98.5%&nbsp;over&nbsp;the&nbsp;wavelength&nbsp;range&nbsp;of&nbsp;380–800&nbsp;nm&nbsp;and&nbsp;98.4%&nbsp;over&nbsp;the&nbsp;wavelength&nbsp;range&nbsp;of&nbsp;380–1400&nbsp;nm.&nbsp;The&nbsp;TiO₂&nbsp;film&nbsp;applied&nbsp;onto&nbsp;the&nbsp;multilayer&nbsp;coatings&nbsp;caused&nbsp;only&nbsp;an&nbsp;approximately&nbsp;0.5%&nbsp;decrease&nbsp;in&nbsp;light&nbsp;transmittance&nbsp;while&nbsp;significantly&nbsp;improving&nbsp;the&nbsp;scratch&nbsp;resistance.</p><p>The&nbsp;obtained&nbsp;results&nbsp;demonstrated&nbsp;that&nbsp;the&nbsp;developed&nbsp;multilayer&nbsp;antireflective&nbsp;coatings&nbsp;were&nbsp;able&nbsp;to&nbsp;simultaneously&nbsp;provide&nbsp;high&nbsp;optical&nbsp;transmittance&nbsp;and&nbsp;scratch&nbsp;resistance.&nbsp;The&nbsp;coatings&nbsp;developed&nbsp;within&nbsp;this&nbsp;project&nbsp;have&nbsp;significant&nbsp;potential&nbsp;for&nbsp;use&nbsp;in&nbsp;solar&nbsp;panels,&nbsp;as&nbsp;well&nbsp;as&nbsp;in&nbsp;optical&nbsp;glasses&nbsp;and&nbsp;other&nbsp;optoelectronic&nbsp;applications&nbsp;requiring&nbsp;high&nbsp;light&nbsp;transmittance.</p>

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