单分子层保护纳米Au粒子表面配位催化剂的制备及其应用

Monolayer-Protected Gold Nanoparticle Surface-Bound Catalysts:Preparation and Application

贵金属纳米粒子由于其小尺寸效应而表现出特殊的催化性能.综述了纳米Au粒子表面配位催化剂的制备方法及其在催化中的应用.由于Au可与硫化物形成配位键,所以硫化物可在Au表面形成有序单分子膜.单分子膜保护的Au纳米粒子具有非常好的溶解性、分散性、稳定性,以及由不同的表面功能团而导致的不同的催化性能.该催化体系兼具均相催化剂和多相催化剂的特点,这对开发新型催化剂具有重要的理论和实际意义.

Precious metal nanomaterials have shown significantly different reactivity and catalytic activity because of their small-size effects. In this report, we focused on gold nanoparticle-based catalysts, especially gold nanoparticle surface-bound catalysts, their preparation and application. Because of its special surface properties, gold can form stable bonds with sulfur containing molecules including sulfides and thiols. These molecules form well ordered self-assembled monolayers on gold nanoparticles, which render monolayer-protected gold nanoparticles （MPGs） with good solubility, easy characterization, extraordinary stability, and versatility. With attached functional groups, we used MPGs as surface-bound catalysts. These catalysts show the combined characteristics of a homogeneous and a heterogeneous catalyst, which is critical for theoretical aspects and in the development of new types of surface-bound catalysts.