Growth and Overgrowth of Concentrated Gold Nanorods: Time Resolved SAXS and XANES
Growth and Overgrowth of Concentrated Gold Nanorods: Time Resolved SAXS and XANES
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DOI：
10.1021/cg2016116
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发表时间：
2012-03-01
影响因子：
3.8
通讯作者：
Spalla, O.
中科院分区：
文献类型：
--
作者：
Hubert, F.;Testard, F.;Spalla, O.
金纳米棒的生长伴随着小角度X射线散射和X射线吸收。使用原位生成种子，在高浓度 3.5 mM 的金中进行合成。结果表明，在种子初始成核后，纳米粒子的生长以恒定的数密度发生，并且 Au(I) 还原为 Au(0) 的最终步骤仅发生在生长的纳米棒的表面。各向异性是在生长过程中获得的，测量的纵向生长速率与基础生长速率之比为12。最终的长宽比仅受可用材料量的限制，并且允许过度生长实验达到最终的长宽比5，而不是最初的3.6。
The growth of gold nanorods has been followed by small angle X-ray scattering and X-ray absorption. The synthesis is performed at high concentration of 3.5 mM in gold using in situ generation of seeds. It is shown that the growth occurs at constant number density of nanoparticles after the initial nucleation of seeds and that the final step of reduction of Au(I) to Au(0) occurs only at the surface of the growing nanorods. Anisotropy is acquired during the growth with a ratio of longitudinal to basal growth rates measured at 12. The final aspect ratio is only limited by the available amount of material and the experiment of overgrowth was allowed to reach a final aspect ratio of 5 instead of the initial 3.6.