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报道了一种制备高长径比金纳米棒的新方法.在25℃条件下,采用种子介导生长法,通过优化表面活性剂十六烷基三甲基溴化铵(CTAB)的浓度,制备了长度(200±18.62)nm,长径比大于10的金纳米棒,并讨论了金纳米棒的形成机制.结果表明,金纳米棒的长径比和纵向吸收波长与CTAB的浓度有关.此外,通过提高反应液的离子强度,利用制备的金纳米棒与球形颗粒不同的静电作用将金纳米棒分离纯化.运用透射电子显微镜(TEM)和扫描电子显微镜(SEM)对金纳米棒的表面形貌进行表征.
A new method for preparing high aspect ratio gold nanorods was reported.At the same time, using the seed-mediated growth method at 25 ℃, by optimizing the concentration of the surfactant CTAB, Gold nanorods with a length of (200 ± 18.62) nm and an aspect ratio of more than 10 were prepared, and the formation mechanism of gold nanorods was discussed.The results showed that the aspect ratio and the vertical absorption wavelength of Au nanorods were related to the concentration of CTAB. In addition, the gold nanorods were isolated and purified by the different electrostatic interactions between the prepared gold nanorods and the spherical particles by increasing the ionic strength of the reaction solution. The surface of the gold nanorods was analyzed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) Morphology was characterized.