Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, South Korea.
Department of Chemistry, Seoul National University, Seoul, 08826, South Korea.
Small. 2021 Aug;17(31):e2101262. doi: 10.1002/smll.202101262. Epub 2021 Jun 23.
Synthetic strategies of web-above-a-ring (WAR) and web-above-a-lens (WAL) nanostructures are reported. The WAR has a controllable gap between the nanoring core and a nanoweb with nanopores for the effective confinement of electromagnetic field in the nanogap and subsequent surface-enhanced Raman scattering (SERS) of Raman dyes inside the gap with high signal reproducibility, which are attributed to the generation of circular 3D hot zones along the rim of Pt@Au nanorings with wrapping nanoweb architecture. More specifically, Pt@Au nanorings are adopted as a plasmonic core for structural rigidity and built porous nanowebs above them through a controlled combination of galvanic exchange and the Kirkendall effect. Both nanoweb and nanolens structures are also formed on Pt@Au nanoring, which is WAL. structure. Remarkably, plasmonic hot zone, nanopores, and hot lens are formed inside a single WAL nanostructure, and these structural components are orchestrated to generate stronger SERS signals.
报道了一种以上方网络（WAR）和上方透镜（WAL）纳米结构的合成策略。WAR 具有纳米环芯和纳米网之间可控的间隙，纳米孔可有效限制纳米间隙中的电磁场，随后在间隙内的拉曼染料发生表面增强拉曼散射（SERS），具有高信号重现性，这归因于沿 Pt@Au 纳米环边缘生成的圆形 3D 热点区，具有包裹纳米网结构。更具体地说，Pt@Au 纳米环被用作等离子体核心，以提供结构刚性，并通过电偶置换和 Kirkendall 效应的受控组合，在其上方构建多孔纳米网。纳米网和纳米透镜结构也在 Pt@Au 纳米环上形成，即 WAL 结构。值得注意的是，单个 WAL 纳米结构内部形成了等离子体热点区、纳米孔和热透镜，这些结构组件被协调以产生更强的 SERS 信号。
