Guangdong Key Laboratory of Nanomedicine, CAS Key Laboratory of Health Informatics, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Science, Shenzhen, 518055, People's Republic of China. Soft Condensed Mater, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, Netherlands.
Nanotechnology. 2017 Jun 16;28(24):245602. doi: 10.1088/1361-6528/aa70f3.
Being able to precisely control the morphologies of noble metallic nanostructures is of essential significance for promoting the surface-enhanced Raman scattering (SERS) effect. Herein, we demonstrate an overgrowth strategy for synthesizing Au @ M (M = Au, Ag, Pd, Pt) core-shell heterogeneous nanocrystals with an orientated structural evolution and highly improved properties by using Au nanorods as seeds. With the same reaction condition system applied, we obtain four well-designed heterostructures with diverse shapes, including Au concave nanocuboids (Au CNs), Au @ Ag crystalizing face central cube nanopeanuts, Au @ Pd porous nanocuboids and Au @ Pt nanotrepangs. Subsequently, the exact overgrowth mechanism of the above heterostructural building blocks is further analysed via the systematic optimiziation of a series of fabrications. Remarkably, the well-defined Au CNs and Au @ Ag nanopeanuts both exhibit highly promoted SERS activity. We expect to be able to supply a facile strategy for the fabrication of multimetallic heterogeneous nanostructures, exploring the high SERS effect and catalytic activities.
能够精确控制贵金属纳米结构的形态对于促进表面增强拉曼散射（SERS）效应至关重要。在此，我们展示了一种通过使用金纳米棒作为种子来合成具有定向结构演化和高度改善性能的 Au@M（M=Au、Ag、Pd、Pt）核壳异质纳米晶体的外延生长策略。在相同的反应条件体系下，我们获得了四种具有不同形状的精心设计的异质结构，包括 Au 凹纳米立方（Au CNs）、Au@Ag 结晶面心立方纳米花生、Au@Pd 多孔纳米立方和 Au@Pt 纳米三叶虫。随后，通过系统优化一系列制备过程，进一步分析了上述异质结构构建块的精确外延生长机制。值得注意的是，明确的 Au CNs 和 Au@Ag 纳米花生都表现出了高度增强的 SERS 活性。我们期望能够为制造多金属异质纳米结构提供一种简便的策略，探索高 SERS 效应和催化活性。
