Assembled beta-Co(OH)(2) Nanoparticles on Reduced Graphene Oxide for Enhanced Magnetism

作者：Liu, Feng; Ye, Shuangli^*; Guo, Huijin; Zhai, Min; Qian, Jun

来源：Journal of Superconductivity and Novel Magnetism, 2014, 27(3): 787-791.

DOI：10.1007/s10948-013-2354-6

• Graphene
• Nanocomposite
• Hybrid
• Superparamagnetism
• Spintronics

A simple and effective method has been developed to assemble the beta-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 beta-Co(OH)(2) nanoparticles to the reduced graphene oxide sheets through the oxygen-containing functional groups. Compared to the paramagnetic property of hexagonal beta-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 beta-Co(OH)(2) nanoparticles and the itinerant pi 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.

• 出版日期2014-3
• 单位武汉大学