Syntheses of Ag/Cu alloy and Ag/Cu alloy core Cu shell nanoparticles using a polyol method

Abstract

Ag-Cu bimetallic nanoparticles were prepared by reducing mixtures of AgNO 3 and Cu(OAc) 2 •H 2 O in ethylene glycol (EG) in the presence of poly(vinylpyrrolidone) (PVP) at 175 o C for 5-60 min. At high [Ag]/[Cu] molar ratios of 1 and 2 or at a short reaction time below 5 min, Ag rich Ag/Cu alloy particles were formed. On the other hand, at low [Ag]/[Cu] molar ratios of 0.25 and 0.5 or a long reaction time above 15 min, Cu shells were overgrown on Au/Cu cores and new Ag/Cu alloy core Cu shell nanoparticles, denoted as Ag/Cu@Cu, were produced. The formation of Ag/Cu and Ag/Cu@Cu particles was examined using energy dispersed X-ray spectroscopic (EDS) measurements. The growth mechanisms of Ag/Cu and Ag/Cu@Cu particles are discussed on the basis of TEM-EDS and ultraviolet (UV)-visible (Vis)-near infrared (NIR) extinction spectral data. The time dependence of UV-Vis spectra indicated that the Cu component of Ag/Cu@Cu particles has higher antioxidized property for than that of Cu and Cu@Ag particles. Syntheses of Ag/Cu alloy and Ag/Cu alloy core Cu shell nanoparticles using a polyol method and 22310060) and Kyushu University G-COE program "Novel Carbon Resource Sciences". Notes and references

Rational Design of Ag‐Based Catalysts for the Electrochemical CO2 Reduction to CO: A Review

“…It was also reported that structure, morphology, size, and composition of the catalyst can lead to adsorption and decoupling site preferences of different adsorbates of C bound on the surface and further result in the breaking of the linear scaling relationships and tuning of the adsorption strength, eventually exerting a dramatic influence on the ECR performance . Indeed, in addition to polycrystalline and single‐crystalline Ag, some new A types have been developed and characterized recently, such as nanostructured Ag with different sizes, supported Ag catalysts with different substrates including C, TiO 2 , Al 2 O 3 , dopant‐aided Ag, oxide‐derived Ag, and surface‐modified Ag …”

Synthesis of Cu-Ag@Ag particles using hyperbranched polyester as template

“…[12,13] Using this method, it is difficult to form a well silver coating on the surface of copper particles. In this paper, the Cu-Ag alloy particles which can provide nucleation sites for Ag + to precipitate were prepared by co-reduction of silver nitrate and copper nitrate at first.…”

Simulated study of plasmonic coupling in noble bimetallic alloy nanosphere arrays

“…Therefore, the plasmonic properties of Ag-Cu alloy nanoparticles would also be expected to enhance due to the formation of Cu 2 O layer (Ag 0.50 Cu 0.50 @Cu 2 O). Moreover, due to the low standard potential of Cu than that of Ag, the reduction of Cu nanoparticle is slower in comparison to the Ag nanoparticles which lead to the formation of Ag-Cu alloy core Cu shell nanoparticles, as Tsuji et al 39 has reported the synthesis of Ag-Cu alloy core Cu shell nanoparticles by using polyol method and discussed its optical properties with better stability. On the other hand, to avoid the oxidation of Ag-Cu nanoparticles, the addition of protection layer might be done.…”