Large-area and flexible amorphous photonic crystals (APCs) featuring interconnected network microstructures are fabricated using high-molecular-weight polystyrene-block-poly(methyl methacrylate) (PS–PMMA) block copolymers. Kinetically controlled microphase separation combining with synergistic weak incompatibility gives rise to short-range-order network microstructures, exhibiting noniridescent optical properties. Solubility-dependent solvatochromism with distinct responses to various organic solvent vapors is observed in the network-forming APC film. By taking advantage of photodegradation of the PMMA block, nanoporous network-forming films were prepared for subsequent template synthesis of robust SiO₂- and TiO₂-based APC films through sol–gel reaction. Consequently, refractive index contrast of the APC film was able to be manipulated, resulting in intensely enhanced reflectivity and increased response rate for detecting solvent vapor. With the integration of self-assembly and photolithography approaches, flexible and robust network-forming APC films with well-defined photopatterned textures are carried out. This can provide a novel means for the design of photopatterned organic or inorganic APC films for sensing solvent vapors.

中文翻译：

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来自形成网络的嵌段共聚物的柔性或鲁棒性非晶光子晶体，用于感测溶剂蒸汽

使用高分子量的聚苯乙烯-嵌段-聚（甲基丙烯酸甲酯）（PS-PMMA）嵌段共聚物制造具有互连网络微结构的大面积，柔性非晶光子晶体（APC）。动力学控制的微相分离与协同的弱不相容性相结合，产生了短程网络微结构，表现出非虹彩的光学特性。在形成网络的APC膜中观察到了与溶解度有关的溶剂变色现象，对各种有机溶剂蒸气有不同的响应。通过利用PMMA嵌段的光降解，制备了纳米孔网络形成膜，用于随后的坚固SiO _2-和TiO ₂模板合成溶胶-凝胶反应制备基于APC的薄膜。因此，能够控制APC膜的折射率对比度，从而大大提高了反射率，并提高了检测溶剂蒸汽的响应率。通过自组装和光刻方法的集成，可以实现具有确定的光图案纹理的灵活而坚固的网络形成APC膜。这可以为设计用于感测溶剂蒸气的有机或无机APC膜的光致图案设计提供一种新颖的方法。