Preliminary Study on the Quick Synthesis of Manganese Oxide-Reduced Graphene Oxide Nano-hybrids and their Magnetic Properties (E-pub Ahead of Print)
Carolina Musse Branco.
Manganese oxide and partially reduced graphene oxide (MnOx-PRGO)
nano-hybrids with variable manganese oxide loading from 38-70 wt.% were
prepared using a simple wet chemical method via a combination of microwave
and sonication processes. The process enabled simultaneous reduction of GO
and KMnO4 and nucleation of MnOx nanoparticles on the oxygen defect sites on
GO. The combination of the two processes further allowed control over
minimising the residual K impurities in such systems. The as-prepared
MnOx-PRGO nano-hybrids were extensively characterised using transmission
electron microscopy, Fourier transform-Infra-red spectroscopy,
thermo-gravimetric analysis and X-ray photoelectron spectroscopy.
The MnOx-PRGO nano-hybrids responded to magnetic fields at room temperature,
which was dependant on the MnOx loading. The sample with ~49 wt.% MnOx
loading and less than 1 at.% K impurity was used for detailed magnetic
studies using magnetic property measurement system (MPMS) SQUID
magnetometer. The system showed some ferromagnetic behaviour at low applied
magnetic fields with Hc = 127.5 Oe and remanant magnetisation of 0.076
emu/g. The Neel temperature was found to be 9 K. The hybrid system showed
paramagnetic behaviour with a near linear 1/χ versus T plot.
Keywords: Graphene, magnetic properties, manganese oxide, microwave, residual oxygen functional groups, ultra sonication
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