Feng Ji, Xu Dongdong, Yang Fan, Chen Jinxing, Wu Chaolumen, Yin Yadong
Department Department of Chemistry, University of California, Riverside, CA, 92521, USA.
School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
Angew Chem Int Ed Engl. 2021 Jul 26;60(31):16958-16964. doi: 10.1002/anie.202105856. Epub 2021 Jun 28.
Engineering the nucleation and growth of plasmonic metals (Ag and Au) on their pre-existing seeds is expected to produce nanostructures with unconventional morphologies and plasmonic properties that may find unique applications in sensing, catalysis, and broadband energy harvesting. Typical seed-mediated growth processes take advantage of the perfect lattice match between the deposited metal and seeds to induce conformal coating, leading to either simple size increases (e.g., Au on Au) or the formation of core-shell structures (e.g., Ag on Au) with limited morphology change. In this work, we show that the introduction of a thin layer of metal with considerable lattice mismatch can effectively induce the nucleation of well-defined Au islands on Au nanocrystal seeds. By controlling the interfacial energy between the seed and the deposited material, the oxidative ripening, and the surface diffusion of metal precursors, we can regulate the number of islands on the seeds and produce complex Au nanostructures with morphologies tunable from core-satellites to tetramers, trimers, and dimers.
在预先存在的晶种上设计等离子体金属（银和金）的成核和生长，有望产生具有非常规形态和等离子体特性的纳米结构，这些纳米结构可能在传感、催化和宽带能量收集等领域找到独特的应用。典型的晶种介导生长过程利用沉积金属与晶种之间完美的晶格匹配来诱导共形包覆，从而导致简单的尺寸增加（例如金在金上）或形成形态变化有限的核壳结构（例如银在金上）。在这项工作中，我们表明引入一层具有相当大晶格失配的薄金属层可以有效地诱导在金纳米晶种上形成明确的金岛。通过控制晶种与沉积材料之间的界面能、氧化熟化以及金属前驱体的表面扩散，我们可以调节晶种上岛的数量，并产生形态可从核 - 卫星结构调谐到四聚体、三聚体和二聚体的复杂金纳米结构。
