The role of trace Ag in the synthesis of Au nanorods†,Nanoscale

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The role of trace Ag in the synthesis of Au nanorods†
Nanoscale ( IF 5.8 ) Pub Date : 2019-06-05 00:00:00 , DOI: 10.1039/c9nr03246k
Liane M. Moreau _{1,

2,

3,

4,

5} , Matthew R. Jones _{1,

2,

3,

4,

5} , Eric W. Roth _{1,

2,

3,

4,

5} , Jinsong Wu _{1,

2,

3,

4,

5} , Sumit Kewalramani _{1,

2,

3,

4,

5} , Matthew N. O'Brien _{2,

3,

4,

5,

6} , Bor-Rong Chen _{1,

2,

3,

4} , Chad A. Mirkin _{1,

2,

3,

4,

6} , Michael J. Bedzyk _{1,

2,

3,

4,

7}

Affiliation

One of the more useful syntheses of single crystalline, uniform Au nanorods from Au spherical seeds relies on the addition of trace Ag ions, yet the role that Ag⁺ plays has remained both elusive and controversial, due in part to lack of knowledge of how the Ag distribution in the nanorod evolves over time. In this work, we fill in this knowledge gap by correlating the spatial distribution of Ag within Au nanorods with nanorod anisotropic growth through time-course X-ray absorption spectroscopy (XAFS)-derived atomic-level elemental coordination paired with electron microscopy for nanoscale morphological analysis. Using this method, a plausible pathway for the conversion of spherical seeds into Au nanorods is proposed. Evidence shows that the nanorod anisotropic growth is directly related to the Ag surface coverage. Anisotropy is induced early in the reaction when Ag first deposits onto the nanoparticle surface, but growth occurs more isotropically as the reaction progresses and Ag diffuses into the nanorod bulk. The results of this investigation and methods employed should be extendable to many anisotropic nanoparticle syntheses that make use of trace elemental species as shape-control additives.

中文翻译：

痕量银在金纳米棒的合成中的作用†

由Au球形种子合成单晶，均匀Au纳米棒的更有用的合成方法之一是添加痕量的Ag离子，而Ag ⁺的作用由于缺乏对纳米棒中银的分布如何随着时间演变的了解，因此游戏仍然是难以捉摸和有争议的。在这项工作中，我们通过基于时程X射线吸收光谱法（XAFS）的原子级元素配位与电子显微镜配对的纳米级形态学，通过将金纳米棒中的Ag的空间分布与纳米棒各向异性的生长相关联来填补这一知识空白。分析。利用这种方法，提出了一种将球形种子转化为金纳米棒的可行途径。有证据表明，纳米棒的各向异性生长与银的表面覆盖率直接相关。当Ag首先沉积到纳米颗粒表面时，会在反应的早期引起各向异性。但是随着反应的进行，各向同性地发生生长，并且Ag扩散到纳米棒中。该研究的结果和所采用的方法应可扩展到许多利用痕量元素作为形状控制添加剂的各向异性纳米颗粒合成方法。

更新日期：2019-06-05

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