Hybrid organic–inorganic nanostructures offer significant potential for developing advanced functional materials with numerous technological applications. However, the fabrication process is often tedious and time-consuming. This study presents a facile method for fabricating block copolymer-based photonic microspheres incorporating plasmonic gold nanoparticles. Specifically, the confined self-assembly of poly(styrene)-b-poly(2-vinylpyridine) in emulsion droplets allows the formation of spherical, noniridescent, concentric lamellar structures, i.e., onion-like particles that are subsequently infiltrated with gold salt. Using ethanol as a preferential solvent allows the loading of metal ions exclusively into the poly(2-vinylpyridine) domains, which are subsequently reduced, leading to the in situ, spatially controlled formation of gold nanoparticles. The hybrid structures exhibit a well-defined photonic bandgap and plasmonic resonance at low gold concentrations. These results demonstrate the feasibility of fabricating optically active photonic structures comprising metal nanoparticles in a block copolymer array via a simple two-step fabrication process.

中文翻译：

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通过在蒸发液滴中进行受限自组装来制备纳米结构杂化嵌段共聚物-金纳米颗粒


有机-无机混合纳米结构为开发具有众多技术应用的先进功能材料提供了巨大的潜力。然而，制造过程通常既乏味又耗时。本研究提出了一种制造含有等离子体金纳米颗粒的嵌段共聚物基光子微球的简单方法。具体来说，聚（苯乙烯）-b-聚（2-乙烯基吡啶）在乳液液滴中的限制自组装允许形成球形、非彩虹色、同心层状结构，即洋葱状颗粒，随后被金盐浸润。使用乙醇作为优先溶剂允许金属离子专门加载到聚（2-乙烯基吡啶）结构域中，随后被还原，导致金纳米颗粒的原位、空间控制形成。杂化结构在低金浓度下表现出明确的光子带隙和等离子体共振。这些结果证明了通过简单的两步制造工艺制造由嵌段共聚物阵列中的金属纳米颗粒组成的光学活性光子结构的可行性。