Zhong Yuanzhi, Liang Guorun, Jin Wenxiu, Jian Zhichao, Wu Zhixiong, Chen Qingyuan, Cai Yuchun, Zhang Wanzhong
Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University Guangzhou 510515 PR China
RSC Adv. 2018 Aug 14;8(51):28934-28943. doi: 10.1039/c8ra04554b.
Due to the competitive growth on the crystal face of seed, it is always difficult to control the morphology of the formation of nanoparticles precisely by a seed-mediated growth method. Herein, we provided a simple but effective technique to synthesize silver nanotriangles using a new silver seed that is capped with citrate-CTA (CTA is cetyltrimethyl ammonium cation). Compared to the preparation of silver nanoparticles (AgNPs) by a conventional seed-mediated method, in this paper, we presented a growth technique with two distinct innovative changes. First, the concentrations of CTAB that we added in silver seed collosol have a significant impact on the size distribution, and silver nanotriangles, nanorods, and nanospheres could be obtained by adjusting the CTAB concentration. Second, the seed prepared by our method has a longer use time, and silver nanotriangles, nanospheres, and nanorods could be prepared by adjusting the aged time of the seed colloid. We have also shown a simple way to control the morphology of silver nanoparticles in almost the same reactive medium by varying the NaOH concentration. Using the new silver seed capped with citrate-CTA, we obtained triangular silver nanoparticles with relatively high regularity. Based on the limited experimental results and IR analysis, a possible mechanism was preliminarily proposed to explain the formation of the seed and the truncated triangular AgNPs.
由于晶种晶面上的竞争性生长，通过晶种介导生长法精确控制纳米颗粒形成的形貌一直很困难。在此，我们提供了一种简单而有效的技术，使用一种新的被柠檬酸盐 - CTA（CTA 是十六烷基三甲基铵阳离子）包覆的银晶种来合成银纳米三角形。与通过传统晶种介导方法制备银纳米颗粒（AgNPs）相比，在本文中，我们提出了一种具有两个明显创新变化的生长技术。首先，我们添加到银晶种溶胶中的 CTAB 浓度对尺寸分布有显著影响，通过调节 CTAB 浓度可以获得银纳米三角形、纳米棒和纳米球。其次，我们方法制备的晶种具有更长的使用时间，通过调节晶种胶体的老化时间可以制备银纳米三角形、纳米球和纳米棒。我们还展示了一种简单的方法，通过改变 NaOH 浓度在几乎相同的反应介质中控制银纳米颗粒的形貌。使用被柠檬酸盐 - CTA 包覆的新银晶种，我们获得了具有相对较高规整度的三角形银纳米颗粒。基于有限的实验结果和红外分析，初步提出了一种可能的机制来解释晶种和截顶三角形 AgNPs 的形成。
