BAM Federal Institute for Materials Research and Testing, Richard Willstätter-Strasse 11, 12489, Berlin, Germany.
Nanoscale. 2010 Nov;2(11):2463-9. doi: 10.1039/c0nr00541j. Epub 2010 Sep 29.
A facile approach for the synthesis of monodisperse gold nanoparticles with radii in the range of 7 to 20 nm is presented. Starting from monodisperse seeds with radii of 7 nm, produced in the first step, the addition of a defined amount of additional precursor material permits distinct size regulation and the realization of predicted nanoparticle sizes. These information were derived from ex- and in situ investigations by comprehensive small angle X-ray scattering (SAXS), X-ray absorption near edge structure (XANES) and UV-Vis data to obtain information on the physicochemical mechanisms. The obtained mechanisms can be transferred to other seeded growth processes. Compared to similar approaches, the presented synthesis route circumvents the use of different reducing or stabilizing agents. The size of resulting nanoparticles can be varied over a large size range presented for the first time without a measurable change in the shape, polydispersity or surface chemistry. Thus, the resulting nanoparticles are ideal candidates for size dependence investigations.
一种制备粒径为 7 至 20nm 的单分散金纳米粒子的简便方法。首先，通过第一步制备粒径为 7nm 的单分散种子，然后加入一定量的额外前体材料，可实现明显的尺寸调控和预期纳米粒子尺寸的实现。这些信息是通过全面的小角 X 射线散射（SAXS）、X 射线吸收近边结构（XANES）和紫外-可见数据的外推和原位研究得出的，以获得关于物理化学机制的信息。所获得的机制可以转移到其他种子生长过程中。与类似的方法相比，所提出的合成路线避免了使用不同的还原剂或稳定剂。所得纳米粒子的尺寸可以在很大的尺寸范围内变化，这是首次在不改变形状、多分散性或表面化学的情况下实现的。因此，所得纳米粒子是尺寸依赖性研究的理想候选者。
