Abstract Plasmonic-photonic metallo-dielectric structures have attracted recent research interests due to their novel optical properties. Au–SiO2 based photonic structures have been built and have shown promising applications for example, as SERS substrates. However, due to the lack of control over the constraints in the various stages of conventional colloidal crystal templating approach, monolayer metallo-dielectric inverse opal structures have not been widely reported. In this work, a 2D hexagonal inverse opal (IO) photonic structure of Au nanoparticles (NP) embedded in a SiO2 matrix is constructed using a new strategy. Here in, a binary Au–SiO2 sol was infiltrated into the accommodative interstices of 2D self-assembled polystyrene (PS) spheres in an air-water interface. Effective removal of the PS spheres by chemical method resulted in Au–SiO2 IO structures. Optical properties of these structures show interesting plasmonic-photonic coupling. When they are used as substrates for Raman signal enhancement of crystal violet, they show better enhancement than either Au nanoparticles aggregates or Au–SiO2 non-photonic structures. The Au–SiO2 IO structures were also used to perform Raman spectroscopy analysis of astaxanthin rich shrimp oil, a novel value-added product extracted from the water used in shrimp processing. The surface enhanced Raman spectra showed the presence of favourable esterified form of astaxanthin in shrimp oil.

中文翻译：

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大面积无裂纹 Au-SiO2 2D 反蛋白石复合膜：制造和 SERS 应用

摘要 等离子光子金属介电结构由于其新颖的光学特性而引起了最近的研究兴趣。已经建立了基于 Au-SiO2 的光子结构并显示出有前景的应用，例如作为 SERS 衬底。然而，由于缺乏对常规胶体晶体模板方法各个阶段的约束的控制，单层金属介电反蛋白石结构尚未得到广泛报道。在这项工作中，使用新策略构建了嵌入 SiO2 基质中的 Au 纳米粒子 (NP) 的二维六边形反蛋白石 (IO) 光子结构。在这里，二元 Au-SiO2 溶胶渗透到空气 - 水界面中 2D 自组装聚苯乙烯 (PS) 球体的调节间隙中。通过化学方法有效去除 PS 球导致 Au-SiO2 IO 结构。这些结构的光学特性显示出有趣的等离子体-光子耦合。当它们用作结晶紫拉曼信号增强的基底时，它们显示出比 Au 纳米颗粒聚集体或 Au-SiO2 非光子结构更好的增强。Au-SiO2 IO 结构还用于对富含虾青素的虾油进行拉曼光谱分析，虾油是一种从虾加工用水中提取的新型增值产品。表面增强拉曼光谱表明虾油中存在有利的酯化形式的虾青素。它们显示出比 Au 纳米颗粒聚集体或 Au-SiO2 非光子结构更好的增强。Au-SiO2 IO 结构还用于对富含虾青素的虾油进行拉曼光谱分析，虾油是一种从虾加工用水中提取的新型增值产品。表面增强拉曼光谱表明虾油中存在有利的酯化形式的虾青素。它们显示出比 Au 纳米颗粒聚集体或 Au-SiO2 非光子结构更好的增强。Au-SiO2 IO 结构还用于对富含虾青素的虾油进行拉曼光谱分析，虾油是一种从虾加工用水中提取的新型增值产品。表面增强拉曼光谱表明虾油中存在有利的酯化形式的虾青素。