Halide-Directed Synthesis of Square Prismatic Ag Nanocrystals by the Polyol Method
Halide-Directed Synthesis of Square Prismatic Ag Nanocrystals by the Polyol Method
复制标题
DOI：
10.1021/acs.chemmater.8b01166
复制
发表时间：
2018-07-24
影响因子：
8.6
通讯作者：
Tao, Andrea R.
中科院分区：
文献类型：
--
作者：
Hsu, Su-Wen;Tao, Andrea R.
实现高质量金属纳米晶的形状控制是自下而上等离子体材料制备中的一个关键挑战。在这里，我们用改进的多元醇法合成了一种独特的各向异性的银纳米晶形状。单晶银方棱柱纳米晶具有两个正方形小面和四个长方形小面，尺寸分布均匀，具有较高的屈服方向。通过光学吸收光谱监测纳米晶体的生长和形状发展，揭示了方棱镜的局域表面等离子体共振现象。与高深宽比形状相关的电动力学增强及其潜在的应用表明，这些纳米晶在等离子体平台上作为光学纳米天线具有很强的近场效应，如表面增强拉曼光谱传感器和光电子结。
Achieving shape control of high-quality metal nanocrystals is a critical challenge in the fabrication of bottom-up plasmonic materials. Here, we synthesize a uniquely anisotropic Ag nanocrystal shape using a modified polyol method. Single-crystalline Ag square prism nanocrystals, which possess two square facets and four rectangular facets, with uniform size distributions and a high yield ( direction. Nanocrystal growth and shape development are monitored through optical absorption spectroscopy, which reveals the localized surface plasmon resonances of the square prisms. Electrodynamic enhancement associated with the high aspect ratio shape and the potential application indicate strong near-field of these nanocrystals as optical nanoantenna in plasmonic platforms, such as surface-enhanced Raman spectroscopy sensors and optoelectronic junctions.