Enhanced microwave absorption properties of PMMA modified MnFe<sub>2</sub>O<sub>4</sub>–polyaniline nanocomposites

Lakshmi, R.V.; Bera, Parthasarathi; Chakradhar, R.P.S.; Choudhury, Balamati; Pawar, Shital Patangrao; Bose, Suryasarathi; Nair, Raveendranath U.; Barshilia, Harish C.

doi:10.1039/c8cp06943c

Cited by 38 publications

(17 citation statements)

References 45 publications

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“…In recent years, the low cost, environmentally friendly nature, chemical, and physical properties of spinel structured complex metal oxides containing two or more types of cations following controlled size and shape have been receiving considerable interest for multifaceted applications . It is reported that magnetic dipoles provided by ferrites having a high value of magnetic permeability and considerable magnetic loss to reduce unwanted EM radiation. , However, ferrite cannot effectively absorb electromagnetic wave due to weak magnetic loss in the high-frequency region due to the Snoek’s limit. − Recently, cobalt based nonferritic spinel oxides, MCo 2 O 4 (MNi, Zn and Mn) have been receiving considerable amount of attention due to their several structure/composition-dependent advantages. − MCo 2 O 4 can be prepared by variety of methods, such as hydrothermal, solvothermal, sol–gel, solid-state, thermal decomposition of organometallic compounds, spray pyrolysis, microwave plasma, etc. These nonferrites find application in a variety of fields, such as lithium-ion batteries, supercapacitors, fuel cell, sensors, electrocatalysts, and magnetic materials, etc.…”

Section: Introductionmentioning

confidence: 99%

“…7 It is reported that magnetic dipoles provided by ferrites having a high value of magnetic permeability and considerable magnetic loss to reduce unwanted EM radiation. 8,9 However, ferrite cannot effectively absorb electromagnetic wave due to weak magnetic loss in the high-frequency region due to the Snoek's limit. 10−13 Recently, cobalt based nonferritic spinel oxides, MCo 2 O 4 (MNi, Zn and Mn) have been receiving considerable amount of attention due to their several structure/ composition-dependent advantages.…”

Section: ■ Introductionmentioning

confidence: 99%

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Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance

Ghosh

Srivastava

2021

Langmuir

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The present work reports on the fabrication of a lightweight microwave absorber comprising MnCo2O4 prepared from the urea complex of manganese (Mn)/cobalt (Co) and nitrogen-doped reduced graphite oxide (NRGO) by facile hydrothermal method followed by annealing process and characterized. The phase analysis, compositional, morphological, magnetic, and conductivity measurements indicated dispersion of paramagnetic MnCo2O4 spherical particles on the surface of NRGO. Our findings also showed that Mn, Co–urea complex, and GO in the weight ratio of 1:4 (NGMC3) exhibited maximum shielding efficiency in the range of 55–38 dB with absorption as an overall dominant shielding mechanism. The reflection loss of NGMC3 was found to be in the range of −90 to −77 dB with minima at −103 dB (at 2.9 GHz). Such outstanding electromagnetic wave absorption performance of NRGO/MnCo2O4 nanocomposite compared to several other metal cobaltates could be attributed to the formation of percolated network assisted electronic polarization, interfacial polarization and associated relaxation losses, conductance loss, dipole polarization and corresponding relaxation loss, impedance matching, and magnetic resonance to some extent.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance

Ghosh

Srivastava

2021

Langmuir

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“…4a) is associated with the (021) lattice plane of JCPDS card no. 53-1891, both are associated with the orthorhombic crystal structure [47][48][49][50][51][52].This small degree of crystallinity is ascribed to the periodicity of benzenoid and quinoid rings present in the PANI structure [53,54]. Furthermore, P-3 was subjected to the FT-IR analysis as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Capacitive property studies of inexpensive SILAR synthesized polyaniline thin films for supercapacitor application

et al. 2019

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The polyaniline (PANI) is an eco-friendly conductive polymer which has been considered for diverse applications. The partially oxidized phase of the PANI is useful for the charge storage application. Here, a unique nanograin/nanofiber structured PANI was grown on inexpensive stainless steel (SS) current collector by the simple oxidative polymerization process and its charge storage properties were systematically investigated. For that, the inexpensive successive ionic layer adsorption reaction method was used to grow a uniform nanostructured PANI on the SS conductor. This evolution of the nanostructure was studied with the Field emission scanning electron microscope. Furthermore, the as-prepared PANI was confirmed by the X-ray diffraction and the Fourier-transform infrared spectroscopy. In the half cell electrochemical testing, the prepared PANI exhibited a maximum specific capacitance of 710 F g −1 with a specific discharge capacity of 119 mAh −1 at 0.2 mA cm −2 in 1 M H 2 SO 4 for the supercapacitor application. Also, by using the power-law relation it was observed that, in a charging and a discharging current, initially a contribution of the diffusive faradaic reactions is more as compared with the surface capacitive non-faradaic reactions.

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“…It is interesting to note that this dielectric loss peak shifts to a lower frequency of 1.22GHz with the addition of MWCNTs to enhance ε ′′ in a low frequency domain. Moreover, the magnetic loss tangent of (ZCFO/MNFO)@C-MWCNTs in Figure 8b indicates a strong magnetic loss absorption of microwave, particularly in the low frequency domain; this is mainly due to the increased μ ′′ of the quaternary hybrid for the reason mentioned above [49].…”

Section: Resultsmentioning

confidence: 99%

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Yin

Zhang

et al. 2019

Nanomaterials

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In this study, the quaternary hybrid of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs with high-performance in low frequency electromagnetic absorption was synthesized via a facile two-step solvothermal synthesis method. The physicochemical properties as well as electromagnetic parameters and microwave absorption performance were characterized by XRD, SEM, TEM, RS, TGA, and VNA, respectively. The results indicate a nuclear-shell morphology of this hybrid for amorphous carbon coated on the surface of Zn0.5Co0.5Fe2O4 and Mn0.5Ni0.5Fe2O4 mixed polycrystalline ferrites. In addition, the MWCNTs synchronously enwind in the nuclear-shell NPs to form a special cross-linking structure. The outstanding low frequency microwave absorption property is attributed to the synergistic effect of dielectric and magnetic loss, better impedance matching condition, and excellent attenuation characteristics of the as-prepared paramagnetic quaternary hybrid. Maximum RL of −35.14 dB at 0.56 GHz with an effective absorption bandwidth in the range of 0.27–1.01 GHz can be obtained with thickness of 5 mm. This hybrid exhibits superior low frequency microwave absorption properties compared with other ferrite-carbon nanocomposites. This investigation provides a new route to prepare suitable candidates for the absorption of electromagnetic waves in a low frequency band on account of its good performance and simple preparation process.

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Enhanced microwave absorption properties of PMMA modified MnFe₂O₄–polyaniline nanocomposites

Abstract: Nanocomposites consisting of polymethyl methacrylate modified MnFe2O4 prepared by solution combustion synthesis and polyaniline exhibit enhanced electromagnetic interference (EMI) shielding property.

Cited by 38 publications

References 45 publications

Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance

Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance

Capacitive property studies of inexpensive SILAR synthesized polyaniline thin films for supercapacitor application

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

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Enhanced microwave absorption properties of PMMA modified MnFe2O4–polyaniline nanocomposites

Abstract: Nanocomposites consisting of polymethyl methacrylate modified MnFe2O4 prepared by solution combustion synthesis and polyaniline exhibit enhanced electromagnetic interference (EMI) shielding property.

Cited by 38 publications

References 45 publications

Fabrication of N-Doped Reduced Graphite Oxide/MnCo2O4 Nanocomposites for Enhanced Microwave Absorption Performance

Fabrication of N-Doped Reduced Graphite Oxide/MnCo2O4 Nanocomposites for Enhanced Microwave Absorption Performance

Capacitive property studies of inexpensive SILAR synthesized polyaniline thin films for supercapacitor application

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

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Enhanced microwave absorption properties of PMMA modified MnFe₂O₄–polyaniline nanocomposites

Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance

Fabrication of N-Doped Reduced Graphite Oxide/MnCo₂O₄ Nanocomposites for Enhanced Microwave Absorption Performance