胶束介质中金纳米粒子合成中前体配合物和反离子作用的临界评价
A Critical Evaluation of the Role of the Precursor Complex and Counterions in Synthesis of Gold Nanoparticles in Micellar Media
摘要：
我们在这里证明，在胶束溶液中获得的金纳米粒子（AuNPs）是容易受到前体络合物的性质和特定的反作用控制的反应动力学，粒径和形状。测试的方法包括在十二烷基三甲基铵（DTA）溶液中，在318 K下，在溴离子（Br）、甲磺酸根（Ms）、三氟乙酸根（TFA）或三氟甲磺酸根（Tf）离子的存在下，用抗坏血酸或柠檬酸还原HAuCl 4络合物。溴离子取代了前体金络合物中的氯离子，并且在没有种子的情况下，在DTA-Br介质中没有观察到纳米颗粒形成。相比之下，扫描电子显微镜图像和原子力显微镜测量表明，准球形金纳米粒子在DTA-MS和DTA-TFA溶液中形成，而在DTA-Tf溶液中获得平坦的盘状或三角形金纳米粒子，在所有这些情况下都不需要添加种子。结果表明，前体金络合物的还原发生在胶束界面，在胶束介质中控制纳米粒子的形成时应考虑特定的反作用。
英文摘要：
We demonstrate here that the gold nanoparticles (AuNPs) obtained in micellar solutions are susceptible to the precursor complex nature and specific counterion effects controlling the reaction kinetics, particles size and shape. The tested approach consisted in reducing the HAuCl4 complex with ascorbic acid or citric acid in dodecyltrimethylammonium (DTA) solutions, at 318 K, in the presence of bromide (Br), methanesulfonate (Ms), trifluoroacetate (TFA) or trifluoromethanesulfonate (Tf) ions. Bromide ions replaced the chloride ions in the precursor gold complex, and no nanoparticle formation could be observed in DTA-Br media, in the absence of seeds. In contrast, scanning electron microscopy images and atomic force microscopy measurements showed that quasi-spherical AuNPs were formed in DTA-Ms and DTA-TFA solutions, while flat disk-like or triangular AuNPs were obtained in DTA-Tf solutions, with no need of adding seeds in all such cases. The results indicated that the reduction of the precursor gold complex takes place at the micellar interface and that the specific counterion effects should be taken into account for controlling nanoparticles formation in micellar media.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
