Dielectric properties evaluation of NiFe2O4/MWCNTs nanohybrid for microwave applications prepared via novel one step synthesis. Issue 5 (1st April 2017) - Soomro, Sumair Ahmed
Abstract: NiFe2 O4 /MWCNTs nanohybrids were synthesized via novel one step ultrasonication assisted method using ortho-xylene as a dispersive medium with varying MWCNTs concentration (0.0%, 1.0%, 1.5%, 2.0% and 2.5%). The nanohybrids were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and Impedance Analyzer techniques. XRD indexed patterns confirmed the formation of NiFe2 O4 /MWCNTs nanohybrid. The SEM images showed the decoration of nickel ferrite nanoparticles on MWCNTs. The FTIR results show two absorption bands. The Cole-Cole plots of impedance show the resistance was only due to the grain boundary contribution. The dielectric properties were found to be increasing with increasing MWCNTs concentration. For 2.5% MWCNTs concentration, dielectric constant and loss 1.06×10 5, 1.99×10 6 were achieved as compared to pure nickel ferrite 6.17×10 3, 3.87×10 4, respectively. Such increase in the dielectric properties renders its application at high frequency Highlights: A facile one step method of dispersion was used for the synthesis of the nanohybrid. The XRD patterns confirmed the formation of NiFe2 O4 /MWCNTs nanohybrid. SEM images showed the complete decoration of NiFe2 O4 on MWCNTs. The dielectric properties were highly enhanced by the addition of MWCNTs in NiFe2 O4 . The Cole-Cole plot show grain boundary contribution decreases with MWCNTs concentration.