Synthesis of multilayered micro flower NiCo2O4/GN/Fe3O4 composite for enhanced electromagnetic microwave (EM) absorption performance

Ding, Juan; Cheng, Ligang; Zhang, Xutong; Liu, Qiangfei

doi:10.1007/s10854-019-01214-2

Cited by 15 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, both MnCo 2 O 4 and NGMC3 possess coercive field (H c ) values equal to ∼0.14 kOe. It appeared that incorporation of nonmagnetic NRGO in MnCo 2 O 4 results in the separation of weakly magnetic MnCo 2 O 4 particles, thereby lowering M s and M r values, while H c remains the same . It may be noted that H c influences the microwave absorption property of a material and depends on magnetic anisotropy, microstructure, grain shape, etc …”

Section: Resultsmentioning

confidence: 99%

“…70 It may be noted that H c influences the microwave absorption property of a material and depends on magnetic anisotropy, microstructure, grain shape, etc. 70 Electromagnetic Interference Shielding Studies. EMI SE of a material represents its ability to attenuate electromagnetic radiation through absorption, reflection, and multiple internal reflections.…”

Section: Go Mnmentioning

confidence: 99%

See 1 more Smart Citation

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

Ghosh

Srivastava

2021

Langmuir

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Go Mnmentioning

confidence: 99%

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

Ghosh

Srivastava

2021

Langmuir

View full text Add to dashboard Cite

show abstract

“…The peaks of metal oxygen were viewed in the positions of 797, 658, and 557 cm –1 . Besides, the sharp absorption peaks around 1549 cm –1 corresponded to the C=C vibration, the peak at 1466 cm –1 confirmed the planar stretching vibration of the C–N bond in the pyrrole ring, and the peaks around 912, 1047, 1188, and 1315 cm –1 were caused by the planar deformation vibration of the C–H and N–H bonds in the pyrrole ring. − FT-IR figures demonstrated that PPy was successfully grown on the surface of magnetic particles.…”

Section: Resultsmentioning

confidence: 85%

Polypyrrole-Coated Composites of Flower-Shaped NiCo₂O₄/Co₃O₄ Nanosheets for Microwave Absorption

Wang,

Zhu,

Ping

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

A 3D flower-like nickel−cobalt oxide/cobalt oxide @ polypyrrole (NiCo 2 O 4 /Co 3 O 4 @PPy) nanocomposite with a core− shell heterostructure was successfully prepared based on the morphology optimization and multicomponent composite strategy. By changing the ratio of PPy, full absorption of multiple bands can be achieved at different thicknesses of the optimized ternary composite. The RL min of NCO/Co 3 O 4 @PPy-2 can achieve −60.27 d B at a thickness of 2.9 mm, which covers the entire X-band with a filler loading of 10%. The maximum effective absorption bandwidth reached 5.25 GHz. The excellent absorption performance is attributed to the electromagnetic synergy effects and impedance matching between NiCo 2 O 4 /Co 3 O 4 and PPy. Therefore, the construction of a 3D core− shell flower heterostructure is an effective strategy for large-scale preparation of NiCo 2 O 4 -based high-performance absorbers, paving an inspirational route for the study of the electromagnetic wave absorption mechanism of hierarchical composite absorbers.

show abstract

“…The rapid development in technology and industry has accelerated the challenges in environment and energy, [7] and there is a need for devices which can effectively prevent electromagnetic radiation and improve charge storage ability [8] . As a result, numerous studies on electromagnetic wave absorption (EMA) materials and supercapacitor materials were carried out by researchers.…”

Section: Introductionmentioning

confidence: 99%

Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

Wu,

Zhu,

Yan

et al. 2023

Chemistry A European J

View full text Add to dashboard Cite

Electromagnetic pollution could harm sensitive electronic equipment due to the rising use of electronic devices and communication infrastructure. The supercapacitor‘s electrochemical performance should be enhanced, and electromagnetic damage should be prevented. This study proposes NiCo2O4/CF composites for supercapacitors and microwave absorption. They are made by combining hydrothermal and annealing processes. Dense NiCo2O4 nanoneedles were uniformly grown on the outer layer of carbon foam (CF) as a growth skeleton, preventing the agglomeration of NiCo2O4. The composite had a specific capacitance of 537.5 F/g at 1 A/g. When the current density was set to 1 A/g, the supercapacitor that used NiCo2O4/CF as the cathode had a specific capacitance of 70.7 F/g, and when the current density was increased to 10 A/g, the original specific capacitance of 87.2 % could still be maintained after 5000 charge‐discharge cycles. At a power density of 3695.5 W/kg, an energy density of 22.1 Wh/kg could be maintained. Furthermore, we performed a microwave absorption test and determined its reflection loss curve for various sample thicknesses. Recombination enhanced the composite material‘s microwave absorption capability by greatly reducing the dielectric loss and the magnetic loss.

show abstract

Synthesis of multilayered micro flower NiCo2O4/GN/Fe3O4 composite for enhanced electromagnetic microwave (EM) absorption performance

Cited by 15 publications

References 43 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

Polypyrrole-Coated Composites of Flower-Shaped NiCo₂O₄/Co₃O₄ Nanosheets for Microwave Absorption

Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

Contact Info

Product

Resources

About

Synthesis of multilayered micro flower NiCo2O4/GN/Fe3O4 composite for enhanced electromagnetic microwave (EM) absorption performance

Cited by 15 publications

References 43 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

Polypyrrole-Coated Composites of Flower-Shaped NiCo2O4/Co3O4 Nanosheets for Microwave Absorption

Dense NiCo2O4 Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties

Contact Info

Product

Resources

About

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

Polypyrrole-Coated Composites of Flower-Shaped NiCo₂O₄/Co₃O₄ Nanosheets for Microwave Absorption

Dense NiCo₂O₄ Nanoneedles Grown on Carbon Foam Showing Excellent Electrochemical and Microwave Absorption Properties