Abstract
The enhancement of microwave absorbing properties in nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) via multiwall carbon nanotubes (MWCNT) growth is studied in this research work. Ni0.5Zn0.5Fe2O4 was initially synthesized by mechanical alloying followed by sintering at 1200 °C and the microstructural, electromagnetic and microwave characteristics have been scrutinized thoroughly. The sintered powder was then used as a catalyst to grow MWCNT derived from chemical vapor deposition (CVD) method. The sample was mixed with epoxy resin and a hardener for preparation of composites. The composite of multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4 shown a maximum reflection loss (RL) of −19.34 dB at the frequency and bandwidth of 8.46 GHz and 1.24 GHz for an absorber thickness of 3 mm for losses less than −10 dB. This acquired result indicates that multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4 could be used as a microwave absorber application in X-band.
Highlights
The high magnetic permeability, high resistivity and low eddy current loss of nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) in the high-frequency region has made them an important candidate in soft magnetic material
The observed diffraction peak appeared around 2θ = 24.6° is corresponds to the graphite (002) plane of multiwall carbon nanotubes (MWCNT), which confirms the retaining of MWCNT structure without any destruction[17]
The existence of graphite lattice plane in XRD pattern indicates that the MWCNT were successfully synthesized by implementing Ni0.5Zn0.5Fe2O4 as a catalyst to grow the MWCNT
Summary
The high magnetic permeability, high resistivity and low eddy current loss of nickel zinc ferrite (Ni0.5Zn0.5Fe2O4) in the high-frequency region has made them an important candidate in soft magnetic material. One of the significant applications of this ferrite in the high frequency region is its high potential EM wave absorption properties. Ni0.5Zn0.5Fe2O4 exhibit good microwave absorbing performance due to its comparative properties to other ferrite[1,2]. As for carbon nanotubes (CNTs) which possess greater surface area and more dangling bonds causing an interfacial polarization and macroscopic quantum tunnel effect, have shown potential microwave absorbing performance[8]. Previous research has shown that various percent of CNT introduction into soft and hard ferrite via sol-gel method, in situ precipitation, hydrothermal and in situ solvothermal has significantly improved the microwave absorption characteristics. In the present research work, multi-walled carbon nanotubes/Ni0.5Zn0.5Fe2O4 was synthesized using chemical vapour deposition (CVD) by using sintered Ni0.5Zn0.5Fe2O4 powder as a catalyst to investigate the impact of hybridization between magnetic and dielectric part towards the electromagnetic and microwave properties of the composite
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