Abstract
An in-situ deposition technique was used in the synthesis of Ni-Zn ferrite-graphene (NZFG) nanohybrids. The XRD patterns revealed the presence of cubic spinel structure of Ni-Zn ferrite (NZF) nanoparticles with good crystallinity and small crystallite sizes. The SEM images showed NZF nanoparticles were uniformly deposited on graphene sheets. The effect of different loading amounts of NZF nanoparticles in the nanohybrids was also investigated by tuning the mass ratio of FeCl 3 and expanded graphite (EG). The magnetic measurements showed ferromagnetic behaviour with low coercivity. Improvements in saturation magnetization of the nanohybrids can be seen with increasing mass ratio of FeCl 3 :EG. The microwave absorption properties were determined based on the measured relative complex permittivity and permeability. For the nanohybrids, the minimum reflection loss (R L ) obtained is -37.57 dB at 7.54 GHz and the absorbing bandwidth in which the R L is less than -10 dB is 7.30 GHz when the NZF content was 79 wt·% at 7 mm thickness. The enhancement in the minimum R L was due to the synergistic effect between NZF nanoparticles and graphene.
Highlights
In recent years, multifunctional nanocomposites comprised of graphene and magnetic nanoparticles have gained a significant amount of interest due to their combinations of properties that are potentially useful in a variety of applications [1,2]
Ni-Zn ferrite (NZF) nanoparticles synthesized in the absence of graphene show characteristic peaks at 2θ = 30.18°, 35.43°, 43.11°, 52.15°, 56.90°, and 62.59° that can be assigned to (220), (311), (400), (422), (511) and (440) lattice planes of cubic unit cell of ferrite
In all the Ni-Zn ferrite-graphene nanohybrids, the peaks of NZF appeared intense and are matched well, which confirms that NZF nanoparticles were successfully deposited on graphene
Summary
Multifunctional nanocomposites comprised of graphene and magnetic nanoparticles have gained a significant amount of interest due to their combinations of properties that are potentially useful in a variety of applications [1,2]. Ni-Zn ferrite (NZF) is considered an excellent candidate of magnetic materials due to their high saturation magnetization, high electrical resistivity, good mechanical strength and chemical stability [4]. In terms of their synthesis methods, chemical methods are more advantageous over traditional milling methods in the preparation of ferrites due to its precise compositions, higher degree of homogeneity and better control of nanoparticle size. Ni-Zn ferrite-graphene (NZFG) nanohybrids with a Ni-Zn ferrite (NZF) composition of Ni0.5Zn0.5Fe2O4 were successfully synthesized through a facile in-situ deposition method at room temperature. The microstructure, morphology and magnetic properties of the resulting nanohybrids were reported
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