Synthesis and Simulation Study of Right Silver Bipyramids via Seed‐Mediated Growth cum Selective Oxidative Etching Approach,Particle & Particle Systems Characterization

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Synthesis and Simulation Study of Right Silver Bipyramids via Seed‐Mediated Growth cum Selective Oxidative Etching Approach
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-04-13 , DOI: 10.1002/ppsc.202000027
Mohammad Tavakkoli Yaraki _{1,

2} , Soroosh Daqiqeh Rezaei _{1,

3} , Eshu Middha ₂ , Yen Nee Tan _{1,

4}

Affiliation

In this study, a simple method to synthesize right silver bipyramid (AgBP) nanostructures via the seed‐mediated growth cum oxidative etching approach in aqueous solution is developed. The key strategy of this method is to control the growth and etching process by careful adjustment of the reactants concentration. Ascorbic acid (AA) is used to reduce silver precursor while cetyltrimethylammonium bromide stabilizer is used to direct the preferential growth of (100) facets. The presence of Cu²⁺ and AA in the reaction mixture also enable in‐situ generation of H₂O₂, leading to selective etching of (111) facets, which is crucial to the formation of anisotropic AgBPs. The structure‐properties of AgBPs is systematically investigated through a series of experiments and theoretical simulations. Transmission electron microscope images and X‐ray diffraction patterns of the as‐synthesized AgBPs show the formation of single crystalline twined nanostructures with a relatively high yield. These results suggest the important role of the excitation of electric dipole in enhancing the electric field at the six sharp corners of AgBPs, making them especially promising for a wide range of technological applications including surface‐enhanced Raman scattering with a significant enhancement factor of 1.50 × 10⁵ as demonstrated herein.

中文翻译：

种子介导生长-选择性氧化刻蚀法合成右双嘧啶银及模拟研究

在这项研究中，开发了一种简单的方法，该方法通过种子介导的生长和氧化蚀刻方法在水溶液中合成正确的双金字塔银（AgBP）纳米结构。该方法的关键策略是通过仔细调整反应物的浓度来控制生长和蚀刻过程。抗坏血酸（AA）用于还原银前体，而十六烷基三甲基溴化铵稳定剂用于指导（100）晶面的优先生长。反应混合物中Cu ²⁺和AA的存在还可以原位产生H ₂ O ₂导致选择性蚀刻（111）刻面，这对形成各向异性AgBP至关重要。通过一系列实验和理论模拟系统地研究了AgBPs的结构性质。合成的AgBP的透射电子显微镜图像和X射线衍射图谱显示，单晶孪晶纳米结构的形成具有相对较高的产率。这些结果表明，电偶极子的激发在增强AgBPs六个尖角处的电场中起着重要作用，这使其特别适用于各种技术应用，包括表面增强拉曼散射，其显着增强因子为1.50×如本文所证明的10 ⁵。

更新日期：2020-04-13

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