Visible and near infrared, wide-angle, anti-reflection coatings with self-cleaning on glass

Camargo, Kelly Cristine; Michels, Alexandre F.; Rodembusch, Fabiano Severo; Kuhn, Matheus Francioni; Horowitz, Flávio

doi:10.1364/ome.2.000969

Cited by 19 publications

(6 citation statements)

References 25 publications

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“…Low-surface energy or superhydrophobic surfaces are self-cleaning in a sense that particulate contaminants adhere only very weakly and are easily washed off by water. The most commonly used route to introduce superhydrophobicity in ARCs is through silanization of the respective inorganic nanostructured coating. − Other approaches include the use of organically modified silica , or a postdeposition of PTFE …”

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confidence: 99%

“…21−23 Other approaches include the use of organically modified silica 24,25 or a postdeposition of PTFE. 26 On the contrary, photocatalytic ARCs do not rely on a cleaning medium, but decompose organic contaminants by light induced redox-reactions. 27 While photocatalytic selfcleaning is in principle more robust and durable, the inclusion of a photocatalytic component in ARCs, typically TiO 2 , poses a major challenge because of its high refractive index (n TiO 2 > 2.5 28 ).…”

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confidence: 99%

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Self-Cleaning Antireflective Optical Coatings

et al. 2013

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Low-cost antireflection coatings (ARCs) on large optical surfaces are an ingredient-technology for high-performance solar cells. While nanoporous thin films that meet the zero-reflectance conditions on transparent substrates can be cheaply manufactured, their suitability for outdoor applications is limited by the lack of robustness and cleanability.Here, we present a simple method for the manufacture of robust selfcleaning ARCs. Our strategy relies on the self-assembly of a blockcopolymer in combination with silica-based sol−gel chemistry and preformed TiO 2 nanocrystals. The spontaneous dense packing of copolymer micelles followed by a condensation reaction results in an inverse opal-type silica morphology that is loaded with TiO 2 photocatalytic hot-spots. The very low volume fraction of the inorganic network allows the optimization of the antireflecting properties of the porous ARC despite the high refractive index of the embedded photocatalytic TiO 2 nanocrystals. The resulting ARCs combine high optical and self-cleaning performance and can be deposited onto flexible plastic substrates.

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Self-Cleaning Antireflective Optical Coatings

et al. 2013

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“…Despite the great advances in the development of ARCs, one issue worth of addressing is that these reported approaches for ARCs are susceptible to absorb water vapors and pollutants due to the presence of open pores and/or interstitial void space between silica nanoparticles, resulting in the deterioration of the ARCs durability. The most common route to address this problem is to introduce superhydrophobicity in ARCs via different approaches including silanization of the nanostructured coatings and postdeposition of fluorinated polymers, − which tended to compromise their AR performance. Recently, several groups proposed an alternative approach by preparing ARCs with closed pore structures. − However, the preparation of ARCs with closed pore structures required sacrificial templates and the removal of the templates using high temperature treatment, which is not suitable for the fabrication of moisture-repellent ARCs coated onto polymeric substrates.…”

Section: Introductionmentioning

confidence: 99%

Broadband Antireflection Coatings Based on Low Surface Energy/Refractive Index Silica/Fluorinated Polymer Nanocomposites

Lin

Chen

et al. 2018

ACS Appl. Nano Mater.

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We demonstrated the fabrication of broadband antireflection coatings (ARCs) comprising low-surface energy/ refractive index (RI) silica/polymer nanocomposites by silica mineralization of layer-by-layer (LbL) assembled poly(2-(dimethylamino)ethyl methacrylate)-block-poly(2,2,3,3-tetrafluoropropyl methacrylate)/poly(L-glutamic acid) (PDMA-b-PTFP/ PGA) multilayer films without any post-treatments. The introduction of the fluorinated polymer (PTFP segments) effectively lowered not only the RI of the as-fabricated coatings but also the surface energy of the constituted pore surface, which rendered the ARCs with high transmittance and durable AR performance by preventing the absorption and capillary condensation of moisture at ambient conditions. Moreover, the formation of nanosized PDMA-b-PTFP vesicles can render the ARCs exhibiting small pore size, which can improve their light transmittance. The coated substrate with an average transmittance over 97.0% was obtained at the visible wavelength region. The combination of LbL assembly and silica mineralization can warrant the preparation of conformal, intact coatings with good mechanical properties. This study demonstrated a novel concept on introducing low surface energy/RI materials for fabricating broadband, moisture-repellent ARCs.

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“…Xu et al [20] obtained highly transparent and thermally stable superhydrophobic silica colloid particles aggregated by formed poly-APS (␥-aminopropyltriethoxysilane) assembled onto the glass substrate by the dip coating method. Camargo et al [21] prepared transparent silica aerogel using tetraethoxysilane (TEOS) as precursor. Layers were deposited using dip-coating method.…”

Section: Introductionmentioning

confidence: 99%