Cobalt/gold (Co/Au) bimetallic nanoparticles are prepared by synthesizing Au via chemical reduction in the presence of pre-synthesized Co nanoparticles. Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) absorption spectrometry, and a superconducting quantum interference device (SQUID) magnetometer have been used to characterize as-prepared bimetallic nanoparticles. Our findings demonstrate Au can not only grow onto Co nanoparticles, but also diffuse into Co nanoparticles. The introduction of Au alters the crystalline structure of Co nanoparticles and changes their magnetic properties. Dodecanethiols can induce the reorganization of as-prepared Co/Au bimetallic nanoparticles.
Citation: Journal of Magnetism and Magnetic Materials
Pub Type: Journals
bimetallic nanoparticle, cobalt nanoparticles, cobalt/gold, magnetic nanoparticles, magnetic properties