Synthesis and Structural Characterization of Ferromagnetic Au/Co Nanoparticles

Abstract

The synthesis of bimetallic magnetic nanoparticles is very challenging because of the agglomeration and non-uniform size. In this paper, we present the synthesis of monodispersed 3-5 nm sized thiolated bimetallic alloyed Au/Co nanoparticles with decahedral and icosahedral shape, their characterization using Cs-corrected scanning transmission electron microscopy (STEM) and magnetic measurements using superconducting quantum interference device (SQUID) magnetometer. The Z-contrast imaging and energy dispersive X-ray spectroscopy (EDS) mapping showed an inhomogeneous alloying with minor segregation between Au and Co at nanoscale and the SQUID measurement exhibited the ferromagnetic behavior.

Synthesis and characterization of Au–Fe alloy nanoparticles embedded in a silica matrix by atom beam sputtering

“…[1][2][3][4][5][6] The enhanced catalytic properties of bimetallic nanoparticles have aroused signicant interest in the eld of chemical catalysis. 7 Bimetallic nanoparticles may form different structures, such as core shell structures, heterostructures and alloy nanoparticles, depending on the metal, relative concentration, and synthesis method used. 8,9 It has been reported by several groups that a solid-solid interface at the surface of an embedded nanoparticle provides extra degrees of control over the properties of the nanoparticles.…”