Key Lab for Organic Electronics & Information Displays (KLOEID), Institute of Advanced Materials (IAM), Synergetic Innovation Center for Organic Electronics and Information Displays, Nanjing University of Posts & Telecommunications, Nanjing 210023, China.
Nanoscale. 2015 Oct 28;7(40):17004-11. doi: 10.1039/c5nr04827c.
The physicochemical properties of noble metal nanocrystals depend strongly on their size and shape, and it is becoming clear that the design and facile synthesis of particular nanostructures with tailored shape and size is especially important. Herein a novel class of hydrangea flower-like hierarchical gold nanostructures with tunable surface topographies and optical properties are prepared for the first time by a facile, one-pot, seedless synthesis using ascorbic acid (AA) to reduce hydrogen tetrachloroaurate (HAuCl4) in the presence of (1-hexadecyl)trimethylammonium chloride (CTAC). The morphologies of the synthesized gold nanoflowers are controlled and fine-tuned by varying the synthetic conditions such as the concentration of reagents and the growth temperature. Due to their unique hierarchical three-dimensional (3D) structures with rich hot spots, these gold nanoflowers exhibit an efficient performance in single-particle surface-enhanced Raman scattering (SERS). The work stands out as an interesting approach for anisotropic particle synthesis and morphological control, and the proposed novel, hierarchical gold nanoflowers have a number of exciting potential applications in SERS-based sensors.
贵金属纳米晶体的物理化学性质强烈依赖于其尺寸和形状，并且越来越明显的是，具有特定形状和尺寸的特定纳米结构的设计和简便合成尤为重要。在此，我们首次通过一种简便的、一锅法的、无种子的合成方法，使用抗坏血酸（AA）在（1-十六烷基）三甲基氯化铵（CTAC）的存在下还原四氯金酸（HAuCl4），制备了一类新型的绣球花状分级金纳米结构，其具有可调的表面形貌和光学性质。通过改变试剂浓度和生长温度等合成条件，可以控制和微调所合成的金纳米花的形貌。由于其具有丰富热点的独特的分级三维（3D）结构，这些金纳米花在单粒子表面增强拉曼散射（SERS）中表现出高效的性能。这项工作是一种用于各向异性颗粒合成和形态控制的有趣方法，所提出的新型分级金纳米花在基于 SERS 的传感器中有许多令人兴奋的潜在应用。
