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首页> 外文期刊>Chemistry: A European journal >Seed-mediated synthesis of gold octahedra in high purity and with well-controlled sizes and optical properties
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Seed-mediated synthesis of gold octahedra in high purity and with well-controlled sizes and optical properties

机译：种子介导的八面体金的高纯度合成，尺寸和光学特性均受控制

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摘要

We report a facile method for the synthesis of uniform Au octahedra with well-controlled sizes and optical properties by seed-mediated growth. Starting from single-crystal seeds of Au spheres with a uniform size, we could reproducibly obtain Au octahedra with a narrow size distribution (<7 % in standard deviation) and in high purity (>90 %). Moreover, the edge lengths of these Au octahedra could be readily tuned in a controllable fashion from 16 to 77nm by varying the amount of seeds, the concentration of HAuCl_4, or both. We have also investigated the effects of water and poly(vinyl pyrrolidone) (PVP) in the system, as well as the reaction temperature, on the evolution of octahedral shape. Gold octahedra with uniform, well-controlled sizes were synthesized by using seeded growth. Starting from single-crystal seeds of Au spheres approximately 11nm in diameter, Au octahedra were obtained with purity >94 % without any purification. In addition, the edge lengths of the Au octahedra could be controlled in the range of 16-77nm by simply varying the amount of seeds, the concentration of HAuCl_4, or both.
机译：我们报告了一种简便的方法，用于通过种子介导的生长合成具有良好控制的大小和光学性质的均匀金八面体。从具有均一尺寸的Au球的单晶种子开始，我们可以可再现地获得具有窄尺寸分布（标准偏差<7％）和高纯度（> 90％）的Au八面体。而且，通过改变种子的数量，HAuCl_4的浓度或两者，可以很容易地以可控制的方式将这些Au八面体的边缘长度从16nm调整到77nm。我们还研究了系统中水和聚乙烯吡咯烷酮（PVP）的影响以及反应温度对八面体形状演变的影响。通过使用种子生长法，可以合成大小均匀，可控的八面体金。从直径约11nm的Au球的单晶种子开始，无需任何纯化即可获得纯度> 94％的Au八面体。另外，可以通过简单地改变种子数量，HAuCl_4的浓度或同时改变两者来将Au八面体的边缘长度控制在16-77nm的范围内。

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