Structural, Microwave, and Magnetic Properties of Self-Assembled Substituted Strontium Ferrite Dot Array on Multiwalled Carbon Nanotubes

Self-assembled Ni-Co-Sn substituted strontium ferrite dot array was formed on the outer surface of functionalized multiwalled carbon nanotubes (MWCNTs) by means of hetero-coagulation. The structural properties were evaluated by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), Mössbauer spectroscopy, and field emission scanning electron microscopy. The obtained results indicate that the single phase strontium ferrite dot array was deposited with almost constant dot spacing on MWCNTs. It was found that the substitution cations preferentially occupy the 12 k sites. Vibrating sample magnetometer (VSM) graphs confirmed that the values of saturation magnetization and coercivity have strong correlation with the volume percentage of MWCNTs. Reflection loss and permittivity values of nanocomposite were also enhanced by increasing the volume percentage of carbon nanotubes in the absorbing media.