Transport properties in spinel ferrite/graphene oxide nanocomposites for electromagnetic shielding

Nawaz, Mamoona; Islam, M.U.; Nazir, Muhammad Aamir; Bano, Iram; Gul, Iftikhar Hussain; Ajmal, Muhammad

doi:10.1016/j.ceramint.2021.05.274

Cited by 32 publications

(7 citation statements)

References 33 publications

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“…9(c), indicating its dependency on the frequency i.e., at a higher frequency, the dielectric loss tangent has the lowest value. 32 One of the characteristics of nanocomposites is that, with a change in frequency, the ac conductivity changes, as noticed in Fig. 9(d), and this behavior can be well-explained by Koop's theory, according to which conductivity shows variation/dispersion in the higher frequency range (>10 5 Hz).…”

Section: Resultsmentioning

confidence: 75%

Graphene nanoplatelets (GNPs): a source to bring change in the properties of Co–Ni–Gd-ferrite/GNP nanocomposites

Latif,

Rehman,

Amin

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 75%

Graphene nanoplatelets (GNPs): a source to bring change in the properties of Co–Ni–Gd-ferrite/GNP nanocomposites

Latif,

Rehman,

Amin

et al. 2023

RSC Adv.

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“…Figure 8 a–f shows the loss tangent for all the prepared samples. The term “dielectric loss tangent” refers to the amount of electrical energy dissipated in a material as a result of several physical processes, including domain wall dielectric resonance, electrical conduction, and dielectric relaxation [ 50 , 51 ]. Following Maxwell–Wagner interfacial polarization, all samples display the same loss tangent behavior.…”

Section: Resultsmentioning

confidence: 99%

“…Depending upon the prepared metal ferrite and the exact metal ferrite composition with graphene (composite samples), the loss tangent for all the prepared composites increases by adding the used graphene percentage due to the high electrical conductivity of graphene [30]. Sintering temperature and structural homogeneity, together with iron ion concentration, all have an effect on the tangent loss values [51]. It is worth mentioning that the hopping of electrons between Fe 2+ and Fe 3+ is regarded as the conduction mechanism in ferrites.…”

Section: Ac Measurementsmentioning

confidence: 99%

Structural, Magnetic, and AC Measurements of Nanoferrites/Graphene Composites

et al. 2022

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As a contribution to the graphene-based nanoferrite composites, this article is intended to present Mn, Co, and Co-Mn nanoferrites for the preparation and investigation of such samples. Nanoparticles of Co ferrite, Mn ferrite, and Co-Mn ferrite were chemically synthesized by the coprecipitation method. The composites of ferrite/graphene were made by incorporating weight ratios of 25% graphene to 75% ferrite. Various structural and characterizing investigations of ferrite samples and ferrite/graphene composites were performed, including XRD, EDX, SEM, VSM hysteresis loops, AC conductivity, and dielectric behavior. The investigations ensured the formation of the intended nanoferrite powders, each having a single-phase crystal structure with no undesired phases or elements. All samples exhibit a soft magnetic behavior. They show a semiconducting behavior of AC electrical conductivity as well. This was proved by the temperature dependence of the AC’s electrical conductivity. Whereas the dielectric function and loss tangent show an expected, well-explained behavior, the ferrite/graphene composite samples have lower saturation magnetization values, lower AC conductivity, and dielectric constant values than the pure ferrites but still have the same behavior trends as those of the pure ferrites. The values obtained may represent steps on developing new materials for expected applications, such as manufacturing supercapacitors and/or improved battery electrodes.

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“…All the characteristic peaks of MCCDF-GNP Composites can be seen in the figure 2. The chemical interaction between graphene oxide and ferrite nanoparticles does not occur because graphene oxide has a low inherent crystalline nature [23]. In sample (M6), MCCD-ferrites with a higher amount of GO generated a tiny peak at 26.60⁰ for the (002) plane of graphene, which was obscured by high-intensity MCCD-ferrites peaks in other composites.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…The addition of GNP to MCCD-ferrites causes structural deformation and macrostrain [22]. Similarly equation ( 5) was used to get the X-ray density (5) where N A = 6.022 × 10 23 mol -1 , while M indicate the molecular weight of ferrite composite [23].…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Synthesis and characterizations of Mg-Cu-Co-Dy ferrites and their composites with graphene nanoplatelets (GNP)

Akhtar¹,

Hussain²,

Yusuf³

et al. 2022

JOR

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Nanocrystalline spinel ferrite Mg0.5Cu0.25Co0.25Fe1.97Dy0.03O4 (MCCD-ferrites) and their composites with graphene nanoplatelets (GNP =0.0%, 1.25% 2.5%, 3.75%, 5%) were prepared by sol-gel technique and sintered at 850 oC for 5 hours. Measurements in the areas of X-ray diffraction, electrical, optical, dielectric and magnetic properties were used to analyze the effects of the inclusion of graphene with ferrite nanoparticles. The crystallite size was determined in the range of 27.62 – 41.46 (nm). The optical bandgap was found in the range of 3.50 eV to 2.88 eV. The dielectric loss was measured between 8 Hz and 8 MHz at room temperature (RT). Magnetic characteristics of the materials are measured and calculated. The magnetic performances of MCCDF-GNP Composites nanoparticles are improved with an increase in saturation (Ms) magnetization. This material can be utilized for humidity sensors, antennae, and micro memory chips.

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Transport properties in spinel ferrite/graphene oxide nanocomposites for electromagnetic shielding

Cited by 32 publications

References 33 publications

Graphene nanoplatelets (GNPs): a source to bring change in the properties of Co–Ni–Gd-ferrite/GNP nanocomposites

Graphene nanoplatelets (GNPs): a source to bring change in the properties of Co–Ni–Gd-ferrite/GNP nanocomposites

Structural, Magnetic, and AC Measurements of Nanoferrites/Graphene Composites

Synthesis and characterizations of Mg-Cu-Co-Dy ferrites and their composites with graphene nanoplatelets (GNP)

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