Magnetic and Reflection Loss Characteristics of Terbium Substituted Cobalt Ferrite Nanoparticles/Functionalized Multi-Walled Carbon Nanotube

摘要

Terbium substituted cobalt ferrite dot array was formed onto surface of multi-walled carbon nanotube by hetero-coagulation. X-ray diffraction (XRD), and scanning electron microscope (SEM) were used to demonstrate the successful attachment of ferrite nanoparticles to MWCNTs. Mössbauer spectroscopy results confirm the preference of terbium for tetrahedral sites. Vibrating sample magnetometer (VSM) confirms the relatively strong dependence of saturation of magnetization and coercivity with the volume percentage of MWCNTs. The complex permittivity, permeability, and reflection loss properties of the ferrite and nanocomposites were studied separately. Reflection loss of nanocomposites is abruptly enhanced in compare to that of ferrite and carbon nanotubes. Reflection loss evaluations indicated that the nanocomposites display a great potential application as wide-band electromagnetic wave absorbers.