چكيده فارسي :
Metallic particles have attracted tremendous interest because of their large surface areas and large numbers of edge and corner atoms, which dramatically improve their catalytic performances [1].Core-shell nanoparticles have given rise to great research interest because of their different novel properties. These nanoparticles have rised at the frontier between materials chemistry and other fields, such as electronics, biomedical, pharmaceutical, optics, and catalysis [2]. Core-shell nanoparticles often exhibit improved catalytic properties compared to their alloyed counterparts or to mixtures of monometallic nanoparticles. In addition to the improved material properties, core-shell materials are also significant from an economic aspect. A precious material can be coated over an inexpensive material to reduce the use of the precious material compared with making the same sized pure material [3].
In this study, a facile and efficient method was used to prepare the Pd@NiZn/reduced-graghene oxide and Pd@NiZn core-shell nano films. The morphologies and structures of the prepared thin films were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive analysis of X-ray (EDAX). Our study shows that both of these core-shell nanostructures display superior activity and durability in catalyzing Suzuki–Miyaura coupling reaction. Compared to the classical reactions, this method consistently has the advantages of a green solvent, short reaction times, low catalyst loading, high yields and reusability of the catalyst.
