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

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• 作者：Feng Liu (1)
  Shuangli Ye (1)
  Huijin Guo (2)
  Min Zhai (1)
  Jun Qian (2)
  
• 关键词：Graphene ; Nanocomposite ; Hybrid ; Superparamagnetism ; Spintronics
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：27
• 期：3
• 页码：787-791
• 全文大小：498 KB
• 作者单位：Feng Liu (1)
  Shuangli Ye (1)
  Huijin Guo (2)
  Min Zhai (1)
  Jun Qian (2)
  
  1. Institute of Microelectronics and Information Technology, Wuhan University, Wuhan, 430072, Hubei, P.R. China
  2. Department of Printing and Packaging, Wuhan University, Wuhan, 430072, Hubei, P.R. China
  
• ISSN：1557-1947

文摘

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.