Abstract
A simple and effective method has been developed to assemble the β-Co(OH)2 nanoparticles coordinated to the surface of the reduced graphene oxide sheets. The reduced graphene oxide-Co(OH)2 hybrid is characterized by transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy techniques, respectively. These morphological and structural analysis results demonstrate the successful attachment of hexagonal β-Co(OH)2 nanoparticles to the reduced graphene oxide sheets through the oxygen-containing functional groups. Compared to the paramagnetic property of hexagonal β-Co(OH)2 nanoparticles, a s-like superparamagnetic behavior can be observed at room temperature for the reduced graphene oxide-Co(OH)2 hybrid by the magnetometer PPMS-9T magnetic measurement, indicative of superparamagnetism. The interplay between the localized magnetic moment of the Co2+ ions in the hexagonal β-Co(OH)2 nanoparticles and the itinerant π carriers in reduced graphene oxide is suggested to be responsible for this superparamagnetic behavior. This enhanced magnetism indicates that the reduced graphene oxide-Co(OH)2 hybrid has a promising potential for spintronic device applications.
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This work is supported by National Natural Science Foundation of China (Grant Nos. 61006080 and 11174226) and Ph.D. Programs Foundation of Ministry of Education of China.
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Liu, F., Ye, S., Guo, H. et al. Assembled β-Co(OH)2 Nanoparticles on Reduced Graphene Oxide for Enhanced Magnetism. J Supercond Nov Magn 27, 787–791 (2014). https://doi.org/10.1007/s10948-013-2354-6
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DOI: https://doi.org/10.1007/s10948-013-2354-6