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首页> 外文期刊>Crystal growth & design >High-Yield Synthesis of Tetrahedral-Like Gold Nanotripods Using an Aqueous Binary Mixture of Cetyltrimethylammonium Bromide and Hexamethylenetetramine
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High-Yield Synthesis of Tetrahedral-Like Gold Nanotripods Using an Aqueous Binary Mixture of Cetyltrimethylammonium Bromide and Hexamethylenetetramine

机译：十六烷基三甲基溴化铵和六亚甲基四胺的二元混合水溶液高产四面体状金纳米三脚架

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摘要

We present an effective strategy to grow the uncommon highly anisotropic shape of tribranched gold nanoparticles (nanotripods) via the reduction of tetrachloroaurate ions (AuCl4-) in an aqueous mixture of cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (HMT) at room temperature. By simply optimizing the concentrations of HAuCl4, NaOH, CTAB, and HMT, gold nanotripods with a dominant Y-shape tetrahedral-like morphology could be obtained in high yield (similar to 80%). While the in-plane growth to form gold nanotripods or branched gold nanocrystals with tips has been reported up to now, the present result exhibited three-dimensional nanostructural growth to form the tetrahedral-like shape of gold nanocrystals. The surface plasmon absorption of the formed gold nanotripods showed a strong peak around 670-800 run depending on the size of nanotripods. The formation and transformation processes of gold nanotripods are discussed on the basis of the changes in absorption spectra.
机译：我们提出了一种有效的策略，通过在室温下在十六烷基三甲基溴化铵（CTAB）和六亚甲基四胺（HMT）的水性混合物中还原四氯金酸根离子（AuCl4-）来生长三支金纳米颗粒（纳米三脚架）的罕见的高度各向异性的形状。通过简单地优化HAuCl4，NaOH，CTAB和HMT的浓度，可以高收率（接近80％）获得具有显着Y型四面体状形态的金纳米三脚架。尽管迄今为止已经报道了形成尖端的金纳米三脚架或分支金纳米晶体的面内生长，但是本结果显示了三维纳米结构生长以形成金纳米晶体的四面体状。形成的金纳米三脚架的表面等离激元吸收在670-800行程附近显示一个强峰，具体取决于纳米三脚架的大小。根据吸收光谱的变化，讨论了金纳米三脚架的形成和转变过程。

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