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Latex-templated porous silica films for antireflective applications

机译：用于抗反射应用的乳胶模板多孔二氧化硅薄膜

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摘要

Thin films with low-refractive index are of great interest to adjust the optical properties of optical components, e.g. reflectivity. In this respect, sol-gel coatings are very efficient for flat glass functionalisation because of ease of application, low cost and versatility. Mesoporous silica films prepared by surfactant self-assembly have been extensively studied but show poor refractive index stability as capillary condensation of atmospheric water can occur in the pores. One way to tackle this issue is to prepare films with larger pores for which capillary condensation is impossible at ambient humidity. Starting from custom made latex nanoparticles, we successfully prepared sol-gel porous silica film with pore size above 30nm and no microporosity in the silica walls. We are then able to independently and accurately tailor pore size, pore volume fraction and pore surface chemistry, leading to a stable refractive index that can be tuned in a large range (from 1.15 to 1.40 at 600 nm).rnPore accessibility as a function of pore size and porous fraction was investigated through ellipsometry-porosimetry for ethanol adsorption, and a transition between open and closed pore structure at decreasing volume fraction was shown. Below the threshold, the films showed a closed porosity structure with a low stable refractive index (down to 1.29 at 600 nm), opening the way to their use for antireflective applications.
机译：具有低折射率的薄膜对于调节光学部件的光学特性是非常令人感兴趣的。反射率。在这方面，溶胶-凝胶涂料由于易于使用，成本低廉和多功能性，对于平板玻璃功能化非常有效。通过表面活性剂自组装制备的介孔二氧化硅膜已被广泛研究，但由于孔隙中会发生大气水的毛细冷凝，因此折射率稳定性差。解决该问题的一种方法是制备具有较大孔的薄膜，这些薄膜在环境湿度下不可能发生毛细管冷凝。从定制的乳胶纳米颗粒开始，我们成功地制备了孔径大于30nm且二氧化硅壁无微孔的溶胶-凝胶多孔二氧化硅膜。然后，我们能够独立，准确地调整孔径，孔体积分数和孔表面化学性质，从而获得可以在较大范围（600 nm为1.15至1.40）范围内调节的稳定折射率。通过椭圆偏振光度法研究了乙醇的孔尺寸和孔隙率，并显示了体积分数减小时开孔和闭孔结构之间的过渡。低于阈值，薄膜显示出具有低稳定折射率（在600 nm时低至1.29）的封闭孔隙结构，为抗反射应用开辟了道路。

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  • 来源
    《Photonics for solar energy systems III》|2010年|P.77250G.1-77250G.8|共8页
  • 会议地点 Brussels(BE)
  • 作者

    F. Guillemot; A. Brunet-Bruneau; E. Bourgeat-Lami; T. Gacoin; E. Barthel; J.-P. Boilot;

  • 作者单位

    Groupe de Chimie du Solide, Laboratoire de Physique de la Matiere Condensee, UMR CNRS 7643, Ecole Polytechnique, 91128 Palaiseau, France Surface du Verre et Interfaces (CNRS/Saint-Gobain) UMR 125, 39 quai Lucien Lefranc, F-93303, Aubervilliers, France Institut des Nanosciences de Paris, UMR 7601, Universite Paris 6, Campus Boucicaut, 140 rue de Lourmel, case 80, 75015 Paris, France Laboratoire de Chimie, Catalyse, Polymeres et Precedes (C2P2), UMR 5265 Univ. Lyon 1, CPE Lyon, CNRS, Batiment 308 F, 43 boulevard du 11 novembre 1918, BP 2077, 69616 Villeurbanne Cedex, France;

    rnInstitut des Nanosciences de Paris, UMR 7601, Universite Paris 6, Campus Boucicaut, 140 rue de Lourmel, case 80, 75015 Paris, France;

    rnLaboratoire de Chimie, Catalyse, Polymeres et Precedes (C2P2), UMR 5265 Univ. Lyon;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用光学;太阳能技术;
  • 关键词

    sol gel silica; latex; low refractive index; antireflective; refractive index stability;

    机译：溶胶凝胶二氧化硅；胶乳;低折射率防反射折射率稳定性;

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