Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Langmuir. 2011 Sep 6;27(17):11090-7. doi: 10.1021/la2019154. Epub 2011 Jul 28.
We report a facile method to synthesize water-soluble gold nanoparticles (AuNPs) using a biosurfactant sodium cholate as reducing reagents and protective groups in aqueous solution at ambient temperature. The diameters (13-70 nm) of uniform AuNPs can be readily adjusted by changing the initial molar ratio of sodium cholate to chloroauric acid (HAuCl(4)). Also, the alkaline condition of preparative solution is found to affect the size of as-synthesized AuNPs. This synthetic approach is one-step and "green". The obtained AuNPs exhibit a good electrocatalytic activity toward methanol oxidation. Meanwhile, the AuNPs thin films can serve as an efficient substrate for surface-enhanced Raman scattering (SERS). Furthermore, platinum nanoparticles (PtNPs) are also prepared by reducing sodium tetrachloro platinate hydrate with sodium cholate.
我们报告了一种简便的方法，使用生物表面活性剂胆酸钠作为还原试剂和保护基团，在水溶液中于室温下合成水溶性金纳米粒子（AuNPs）。通过改变初始胆酸钠与氯金酸（HAuCl（4））的摩尔比，可以轻松调节均匀 AuNPs 的直径（13-70nm）。此外，还发现制备溶液的碱性条件会影响合成的 AuNPs 的尺寸。这种合成方法是一步法和“绿色”的。所得到的 AuNPs 对甲醇氧化表现出良好的电催化活性。同时，AuNPs 薄膜可用作表面增强拉曼散射（SERS）的有效基底。此外，还可以通过用胆酸钠还原四氯合铂酸钠水合物来制备铂纳米粒子（PtNPs）。
