The fabrication of highly reflective inorganic distributed Bragg reflectors (DBRs) from aqueous solutions of colloidal flakes is demonstrated. Our approach involves the deposition of compact or mesoporous TiO₂–SiO₂–TiO₂ trilayers onto a patterned sacrificial layer. A subsequent etch-release of the patterned flakes into water results in a colloidal flake solution. Drops of this flake-containing solution are then deposited onto another substrate, where they self-assemble into stacks upon solvent evaporation. This method gives rise to high quality DBRs in a much quicker fabrication process compared to previously established methods and produces ordered DBRs of high reflectivity. Changing compact for mesoporous assemblies, the produced DBRs can be used for environmental refractive index sensing. The presented approach may open the way for the on-demand integration of stimuli-responsive DBRs into microfluidic and fiber-end sensing applications or allow the integration of highly reflective colloidal flakes with light emission and detection technologies.

中文翻译：

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胶态三层片状溶液的分布式布拉格反射器

演示了由胶体薄片的水溶液制备高反射性无机分布布拉格反射器（DBR）。我们的方法涉及沉积致密或介孔的TiO ₂ -SiO ₂ -TiO ₂三层到图案化的牺牲层上。随后将图案化的薄片蚀刻释放到水中，得到胶体薄片溶液。然后，将这种含片状溶液的液滴沉积到另一个基材上，在溶剂蒸发后它们会自组装成堆栈。与先前建立的方法相比，该方法以更快的制造过程产生了高质量的DBR，并产生了高反射率的有序DBR。改变了介孔组件的结构，所生产的DBR可用于环境折射率传感。所提出的方法可以为将刺激响应性DBR按需集成到微流体和光纤末端传感应用中开辟道路，或者允许将高反射胶体薄片与发光和检测技术集成在一起。