Institute of Chemistry-UFRGS, Porto Alegre, 91501-970, RS, Brazil.
Nanoscale. 2017 Dec 7;9(47):18753-18758. doi: 10.1039/c7nr06167f.
Surface-clean Au nanoparticles (NPs) confined in films of ionic liquids (ILs) can be easily fabricated by sputtering deposition. A silicon wafer coated with films of both hydrophobic (bis((trifluoromethyl)sulfonyl)amide, NTf) and hydrophilic (tetrafluoroborate, BF) imidazolium-based ILs forms an 'ionic carpet-like' structure that can be easily decorated with Au NPs of 5.1 and 6.5 nm mean diameter, respectively. The depth profile distribution of the Au NPs depends on the arrangement of the IL, which is controlled mainly by the anion volume. Higher concentrations of Au NPs are found closer to the IL surface for the system containing a larger anion (NTf) whereas Au NPs are located deeper in the IL for the system containing a smaller anion (BF). The Au NPs are well distributed over the IL/Si support and are strictly confined in a single layer of the IL. This method is among the most simple and versatile for the generation of liquid layers containing surface-clean, stable and confined Au NPs.
表面清洁的金纳米粒子 (NPs) 被限制在离子液体 (IL) 的薄膜中，可以通过溅射沉积来轻松制备。硅片涂有疏水性 (双((三氟甲基)磺酰基)酰胺，NTf) 和亲水性 (四氟硼酸，BF) 咪唑基 IL 的薄膜，形成一种“离子地毯状”结构，可以轻松地用直径分别为 5.1 和 6.5nm 的 Au NPs 进行修饰。Au NPs 的深度分布取决于 IL 的排列，这主要由阴离子体积控制。对于含有较大阴离子 (NTf) 的体系，Au NPs 离 IL 表面更近，而对于含有较小阴离子 (BF) 的体系，Au NPs 则位于 IL 更深的位置。Au NPs 在 IL/Si 载体上分布均匀，并严格限制在 IL 的单层中。这种方法是最简便、最通用的方法之一，可以生成含有表面清洁、稳定和受限的 Au NPs 的液体层。
