Journal
CARBON
Volume 47, Issue 11, Pages 2648-2654Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2009.05.022
Keywords
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Funding
- National Natural science Foundation [50772074]
- State Major Research Plan (973) of China [2006CB932300]
- Nano-Foundation of Shanghai in China [0852nm01200]
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials [2009KF04]
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Size- and surface-tunable carbon spheres loaded with iron-oxide (alpha-Fe2O3 or Fe3O4) nanoparticles have been obtained from 4-ferrocenyl-butyric acid via an easy one-step method in a solvothermal system. The composites obtained have been fully characterized by Xray powder diffraction, scanning and transmission electron microscopy, Fourier transform infrared spectrometry; Raman spectrometry and vibrating sample magnetometry. The results show that the diameters and morphologies of the spheres can be tuned by adjusting the experimental parameters including the reaction temperature, time, medium, and precursor concentration. Most of the iron-oxide nanoparticles are evenly distributed on the surface of the carbon spheres and also the surface of the iron-oxide-loaded carbon spheres has large numbers of functional groups. The alpha-Fe2O3-loaded carbon spheres show special magnetic properties with a coercivity of 101.5 Oe and a remanent magnetization of 0.203 emu/g at room temperature, while the coercivity and remanent magnetization for the Fe3O4-loaded carbon spheres are 58.4 Oe and 0.174 emu/g, respectively A possible formation mechanism is proposed and discussed based on the features of the reaction system. (C) 2009 Elsevier Ltd. All rights reserved.
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