Preparation of Cu@Ag Core–Shell Nanoparticles Using a Two-step Polyol Process under Bubbling of N2 Gas

Abstract

Cu core–Ag shell nanoparticles, denoted as Cu@Ag, were prepared using a two-step polyol reduction process under bubbling N2 gas. Formation of Cu@Ag particles with an average size of ca. 80 nm was confirmed using energy-dispersed X-ray spectroscopic (EDS) measurements. The Cu particle oxidation was suppressed greatly by Ag shell covering.

Microwave‐Assisted Efficient One‐Pot Multi‐Component Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Cu@Ag Core‐Shell Nanoparticle

“…The weakening of SPR band for the core metal in the presence of a shell metal has been reported earlier for Cu 1 @Ag 1 nanoparticles having an Ag shell in outer region . Similarly, no SPR peak of Ag was observed in the absorption peak of Ag 1 @Cu 1 core‐shell nanoparticle, confirming the formation of Cu shell . For physical mixture of Ag and Cu nanoparticle, UV‐vis spectrum showed two distinct SPR bands; one at 569 nm for Cu nanoparticles and another at 414 nm for Ag nanoparticles …”

“…The line scan along the direction of Ag 1 ‐Cu 3 alloy NPs derived in Figure a demonstrate the identical distribution of Ag and Cu in the NPs with higher concentration of Cu. In Ag 1 @Cu 3 (Figure b), the peak profile intensity of Ag is higher at the centre whereas the peak intensity of Cu in higher at the edges suggesting the formation of Ag core and Cu shell . Similarly, in Figure c, the EDS line scanning profiles on the single nanoparticle further confirm that the Cu 3 @Ag 1 are composed of a distinct Cu rich centre and Ag rich boundary, confirming the formation of Cu 3 @Ag 1 NP catalyst.…”

Printable inorganic nanomaterials for flexible transparent electrodes: from synthesis to application

“…The shell is usually made of noble metals mainly through two methods. One is based on the use of a reducing agent, immobilized on the surface of core pre-particles [72] . The other one, called transmetalation, is based on galvanic displacement reaction which just occurs on the surface of Cu NPs [63] .…”

Sintering of multiple Cu–Ag core–shell nanoparticles and properties of nanoparticle-sintered structures

“…[8][9][10][11][12] However, the cost of Ag has increased signicantly over the last few years and is not projected to display a reduction trend in the near future, 13 which has limited the wide industrial applications of Ag NP. Thus, Cu-Ag core-shell (CS) NP have been synthesized as a potential alternative to pure Ag NP; [14][15][16] this allows for the tremendous reduction of production costs, enhanced protection of the Cu core from oxidation, and thereby maintaining the desirable thermal and electrical properties for electronic applications.…”