Department of Chemical and Biomolecular Engineering, National University of Singapore , 10 Kent Ridge Crescent, Singapore 119260.
ACS Nano. 2012 Sep 25;6(9):7920-7. doi: 10.1021/nn3023206. Epub 2012 Aug 27.
The design of an efficient synthesis for large-scale production of atomically precise nanoclusters (NCs) is pivotal in realizing the size-dependent properties of the NCs. A simple and versatile method for producing atomically precise thiolated gold NCs (Au(25)(SR)(18) NCs) in large quantities (~200 mg) is demonstrated in this study. It uses a gaseous reducing agent, carbon monoxide (CO), to support a slow and size-controlled growth of Au(25)(SR)(18) NCs. Absorption measurements of the reaction solution, which underwent distinct color changes (colorless → yellow → orange → brown → red-brown), allowed the formation of thiolated Au(25) NCs to be reconstructed from several key intermediates. The unique reaction environment provided by gaseous CO presents a new synthetic route to fabricate atomically precise metal NCs in quantities large enough for application explorations.
本研究提出了一种简单通用的方法，可大量（约 200mg）制备原子精确的巯基化金纳米团簇（Au(25)(SR)(18) NCs）。该方法使用气态还原剂一氧化碳（CO）来支持 Au(25)(SR)(18) NCs 的缓慢和尺寸可控生长。反应溶液的吸收测量显示出明显的颜色变化（无色→黄色→橙色→棕色→红棕色），从而可以从几个关键中间体重建出巯基化 Au(25) NCs 的形成过程。由气态 CO 提供的独特反应环境为制备原子精确的金属 NCs 提供了一种新的合成途径，其产量足以进行应用探索。
