Hernández-Garrido J C, Moreno M S, Ducati C, Pérez L A, Midgley P A, Coronado E A
Departamento de Ciencia de los Materiales, Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Río San Pedro s/n, Puerto Real, 11510, Spain.
Nanoscale. 2014 Nov 7;6(21):12696-702. doi: 10.1039/c4nr03017f.
In the design and engineering of functional core-shell nanostructures, material characterization at small length scales remains one of the major challenges. Here we show how electron tomography in high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) mode can be applied successfully to perform nano-metrological characterization of Au@Ag core-shell nanostructures. This work stresses the benefits of HAADF-STEM tomography and its use as a novel and rigorous tool for understanding the physical-chemical properties of complex 3D core-shell nanostructures. The reconstructed Au@Ag core-shell architecture was used as an input for discrete dipole approximation (DDA)-based electrodynamics simulations of the optical properties of the nanostructures. The implications of localized surface plasmon spectroscopy as well as Raman-enhanced spectroscopy are analysed.
在功能性核壳纳米结构的设计与工程中，小尺度下的材料表征仍然是主要挑战之一。在此，我们展示了如何成功应用高角度环形暗场扫描透射电子显微镜（HAADF-STEM）模式下的电子断层扫描技术，对Au@Ag核壳纳米结构进行纳米计量表征。这项工作强调了HAADF-STEM断层扫描的优势，以及它作为一种新颖且严谨的工具，用于理解复杂三维核壳纳米结构物理化学性质的用途。重建后的Au@Ag核壳结构被用作基于离散偶极近似（DDA）的纳米结构光学性质电动力学模拟的输入。分析了局域表面等离子体光谱以及拉曼增强光谱的意义。
