Current Graphene Science

Zhen Zhou  
Nankai University
P.R. China

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Preliminary Study on the Quick Synthesis of Manganese Oxide-Reduced Graphene Oxide Nano-hybrids and their Magnetic Properties

(E-pub Ahead of Print)

Author(s): Surbhi Sharma, Jake Mclaughlin, Carolina Musse Branco.

Abstract:

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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Article Details

VOLUME: 1
Year: 2017
(E-pub Ahead of Print)
DOI: 10.2174/2452273201666161213102021
Price: $95