1 research outputs found
Controllable Magnetism of CoO Nanoparticles Modified by the Reduced Graphene Oxide
Rocksalt CoO nanoparticles (CNPs)
have been prepared with a facile
solvothermal method. To control the magnetism of CNPs, the reduced
graphene oxide (RGO) is adopted to engineer the CNPs. Enwrapped by
the atomic-layered carbon sheets, the CNPs can be reduced locally.
The CoO/RGO composites were prepared by one-pot and two-pot synthetic
methods, respectively. Compared with the CoO/RGO raw composite that
have no magnetization hysteresis loop, the weak and the strong hysteresis
loops emerged successively via heating the particles at different
temperatures and maintaining their nanoscales. The magnetism can be
adjusted by controlling the temperature via two routes. By the one-pot
synthetic route, the CNPs can be reduced sharply, and an obvious hysteresis
is available around 400 °C, which is ascribed to the appearance
of Co nanoclusters decorated in the corners of CNPs. By the two-pot
synthetic route, a weak and gradually enhanced hysteresis can be observed,
and its magnetic properties should be ascribed to the topological
defects of RGO. Our findings have opened a new way to acquire nanoparticles
with controllable magnetism