Synergistic effect in bimetallic copper–silver (Cu_xAg) nanoparticles enhances silicon conversion in Rochow reaction

Abstract

The oleylamine thermal reduction process was employed to prepare bimetallic copper-silver (Cu x Ag (0 # x # 50)) nanoparticles, such as Cu, Cu 50 Ag, Cu 20 Ag, Cu 10 Ag, Cu 5 Ag, CuAg, CuAg 2 , and Ag, by using Cu(CH 3 COO) 2 and AgNO 3 as the precursors. The samples were characterized by X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The Cu x Ag hybrid nanostructure showed good particle dispersion, and Cu and Ag metals were well mixed. The catalytic properties of these bimetallic Cu x Ag nanoparticles as model catalysts for the Rochow reaction were explored. Compared to monometallic Cu and Ag nanoparticles, bimetallic Cu x Ag nanoparticles resulted in a much higher silicon conversion, which is attributed to the synergistic electronic effect between Cu and Ag metals. For example, the Cu atom was observed to have a lower electron density in the Cu x Ag bimetallic nanoparticle than that in monometallic Cu nanoparticles, which enhanced the formation of methylchlorosilanes on the silicon surface with chloromethane, demonstrating the significance of the Cu x Ag bimetallic catalysts in catalytic reactions during organosilane synthesis. The insights gained in this study should be conducive to the design of good Cubased catalysts for the Rochow reaction.

Plasmonic Sensor Based on Interaction between Silver Nanoparticles and Ni2+ or Co2+ in Water

“…Figure S7 in supporting information reports a high resolution TEM image of a single nanoparticle presenting a greater radius with respect to the average value, but showing the good crystallinity of the material. The measured lattice parameter is 0.24 nm (111 plane), as reported in the figure, which is in close agreement with the lattice parameter of the silver nanoparticles reported in the literature [ 52 , 53 ].…”

A highly active worm-like PtMo nanowire for the selective synthesis of dibenzylamines

“…41 Moreover, the synergistic electronic effect between two metals may have important role in the catalytic reaction. 42 Hydrogen on the surface of Pt sites can migrate over to the Mo species, liberating the Pt active sites. 31 Real-time GC measurement was used to track the kinetic processes of the transformation.…”

In situ synthesis of copper nanoparticles encapsulated by nitrogen-doped graphene at room temperature via solution plasma

“…The interplanar lattice space was found to be 0.21 nm, corresponding to that of Cu nanoparticles. 25 The particle size of Cu-NFG-100 was ranging from 5 nm to 11 nm, as shown in the inset of Fig. 2a.…”