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Effect of TiCl4 treatment on the refractive index of nanoporous TiO2 films

机译：TiCl4处理对纳米多孔TiO2薄膜折射率的影响

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摘要

We investigate the effect of TiCl4 treatment on the refractive index of a nanoporous TiO2 film. A nanoparticulate TiO2 film prepared on a glass substrate was immersed in a TiCl4 aqueous solution. The subsequent reaction of TiCl4 with H2O produces TiO2 and thus modifies the density and the refractive index of the film. With increasing TiCl4 concentration, the refractive index initially increased and then declined after being maximized (n = 2.02 at 633 nm) at 0.08 M concentration. A refractive index change as large as 0.45 could be obtained with the TiCl4 treatment, making it possible to achieve diffraction efficiency exceeding 80% in a diffraction grating-embedded TiO2 film. For high TiCl4 concentrations of 0.32 M and 0.64 M, the refractive index remained nearly unchanged. This was attributed to the limited permeability of high-viscosity TiCl4 solutions into the nanoporous films. The measured pore size distributions were in good agreement with the results of a diffraction analysis and refractive index measurement. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们研究了TiCl4处理对纳米多孔TiO2薄膜折射率的影响。将在玻璃基板上制备的纳米颗粒TiO2膜浸入TiCl4水溶液中。 TiCl4与H2O的后续反应生成TiO2，从而改变了薄膜的密度和折射率。随着TiCl4浓度的增加，在0.08 M的浓度下最大（在633 nm处n = 2.02）时，折射率开始增加，然后下降。通过TiCl 4处理，可以获得0.45的大的折射率变化，从而可以在嵌入有衍射光栅的TiO 2膜中实现超过80％的衍射效率。对于0.32 M和0.64 M的高TiCl4浓度，折射率几乎保持不变。这归因于高粘度TiCl4溶液进入纳米多孔膜的渗透性有限。测得的孔径分布与衍射分析和折射率测量的结果非常吻合。 （C）2015 Elsevier B.V.保留所有权利。

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