Synthesis of superparamagnetic nanoparticles dispersed in spherically shaped carbon nanoballs
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In this work, carbon nanoballs in spherical shape with diameter 70 ± 2 nm containing well-dispersed superparamagnetic magnetite/maghemite Fe3O4/γ-Fe2O3 nanoparticles of 5–10 nm in size were synthesised by a facile route using the radio frequency (rf) plasma in order to assist the pyrolysis of ferrocene. Ferrocene was placed in an inductively coupled rf plasma field without additional thermal heating to activate simultaneous sublimation and pre-pyrolysis processes. During this plasma activation, the resultant derivatives were carried by an argon gas stream into the hot zone of a resistance furnace (600 °C) for complete thermal decomposition. The deposition of the nanoballs could be observed in the hot zone of the furnace at a temperature of 600 °C. The synthesised nanoballs are highly dispersible in solvents that make them particularly suitable for different applications. Their morphology, composition and structure were characterized by high-resolution scanning and transmission electron microscopy, including selected area electron diffraction, electron energy loss spectroscopy and X-ray diffraction. Magnetic measurements demonstrated that the nanoballs possess superparamagnetic characteristics.
KeywordsPlasma Magnetic nanoparticles Superparamagnetic iron oxide Carbon
The authors are grateful to Sieglinde Pichl and Gesine Kreutzer for help with SEM and HRTEM measurements. Authors would like to express their gratitude to Dietmar Meiler and Alexander Schubert for the technical support during the experimental work. The authors thank the Deutsche Forschungsgemeinschaft DFG for financial support under the contract number HA 5133/4-1. Also it is worth noting that, the work was partly supported by the Deutsche Forschungsgemeinschaft DFG under contract number WO 1532/1-2.