Broadband and strong microwave absorption of Fe/Fe3C/C core–shell spherical chains enhanced by dual dielectric relaxation and dual magnetic resonances

Sun, Jia Cheng; He, Zidong; Dong, Wenjing; Wu, Wenhua; Tong, Guoxiu

doi:10.1016/j.jallcom.2018.12.198

Cited by 56 publications

(10 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 11 b, the values of fluctuate with frequency, which illustrates that the eddy current loss is weak and the magnetic loss mainly comes from magnetic resonance [ 57 , 58 ]. Magnetic hysteresis loops in Fig.…”

Section: Resultsmentioning

confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

151

View full text Add to dashboard Cite

HIGHLIGHTS• Hierarchically porous Fe-Co/N-doped carbon/rGO (Fe-Co/NC/rGO) composites were successfully prepared. Macropores, mesopores, and micropores coexisted in the composites.• Hierarchically porous Fe-Co/NC/rGO showed effective bandwidth of 9.29 GHz.ABSTRACT Developing lightweight and broadband microwave absorbers for dealing with serious electromagnetic radiation pollution is a great challenge. Here, a novel Fe-Co/N-doped carbon/reduced graphene oxide (Fe-Co/NC/rGO) composite with hierarchically porous structure was designed and synthetized by in situ growth of Fe-doped Cobased metal organic frameworks (Co-MOF) on the sheets of porous cocoon-like rGO followed by calcination. The Fe-Co/NC composites are homogeneously distributed on the sheets of porous rGO. The Fe-Co/NC/rGO composite with multiple components (Fe/Co/NC/rGO) causes magnetic loss, dielectric loss, resistance loss, interfacial polarization, and good impedance matching. The hierarchically porous structure of the Fe-Co/NC/rGO enhances the multiple reflections and scattering of microwaves. Compared with the Co/NC and Fe-Co/NC, the hierarchically porous Fe-Co/NC/rGO composite exhibits much better microwave absorption performances due to the rational composition and porous structural design. Its minimum reflection loss (RL min ) reaches − 43.26 dB at 11.28 GHz with a thickness of 2.5 mm, and the effective absorption frequency (RL ≤ − 10 dB) is up to 9.12 with the same thickness of 2.5 mm. Moreover, the widest effective bandwidth of 9.29 GHz occurs at a thickness of 2.63 mm. This work provides a lightweight and broadband microwave absorbing material while offering a new idea to design excellent microwave absorbers with multicomponent and hierarchically porous structures.

show abstract

Section: Resultsmentioning

confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

151

View full text Add to dashboard Cite

show abstract

“…A premise of the excellent wave-absorbing performance is that incident waves could transmit into the absorbers and there are almost no reflections on the interface of air and absorbers. Usually the ratio of the input impedance ( Z in ) and that of free space ( Z 0 = (μ 0 /ε 0 ) 1/2 = ∼377 Ω) is used to characterize the impedance matching properties, and Z in / Z 0 = 1 means the input waves enter the materials without any reflections. , Figure a shows the frequency dependences of the impedance ratio ( Z in / Z 0 ) for the paraffin composites at the optimized thickness. A high impedance matching degree is achieved for Fe-0 at the low-frequency region, while the paraffin composites with Fe-1, Fe-2, and Fe-4 possess high impedance matching properties in the high-frequency band.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Fe@Fe₃C/C Nanocomposites Derived from Bulrush for Excellent Electromagnetic Wave-Absorbing Properties

Fan

Jiang

Xin

et al. 2019

ACS Sustainable Chem. Eng.

105

View full text Add to dashboard Cite

Carbon-based composites have shown excellent electromagnetic wave-absorption properties. In this work, an extremely facile and green method was developed to prepare Fe@Fe3C/C nanocomposites by carbonizing the bulrush impregnated with Fe(NO3)3 solutions. The core–shell Fe@Fe3C was generated from carbothermal reductions and interfacial reactions. The minimum reflection loss exceeded −50 dB with absorbers thickness almost no more than 2.00 mm. The widest absorption bandwidth was up to 4.57 GHz with a thickness only 1.43 mm. Meanwhile, the absorption performance with RL < −10 dB could be observed in a bandwidth of about 15 GHz as absorbers thickness varied from 1.00 to 5.00 mm. The excellent wave-absorbing properties could be attributed to the synergistic effect of dielectric loss and magnetic loss of Fe@Fe3C/C nanocomposites. Also, the optimized impedance matching and high attenuation abilities of absorbers contributed to the absorption performance. This work provides a new way of recycling the abundant natural herbage waste to be used in electromagnetic applications.

show abstract

“…Table 1 summarizes the electromagnetic wave absorption performances between (ZCFO/MNFO)@C-MWCNTs and related hybrids reported in other literature [65,66,67,68,69,70,71,72,73,74,75]. It is clear that the electromagnetic absorption band of most hybrids are located in the relatively high frequency range.…”

Section: Resultsmentioning

confidence: 96%

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

View full text Add to dashboard Cite

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.

show abstract

Broadband and strong microwave absorption of Fe/Fe3C/C core–shell spherical chains enhanced by dual dielectric relaxation and dual magnetic resonances

Cited by 56 publications

References 50 publications

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Facile Synthesis of Fe@Fe₃C/C Nanocomposites Derived from Bulrush for Excellent Electromagnetic Wave-Absorbing Properties

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

Contact Info

Product

Resources

About

Broadband and strong microwave absorption of Fe/Fe3C/C core–shell spherical chains enhanced by dual dielectric relaxation and dual magnetic resonances

Cited by 56 publications

References 50 publications

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Facile Synthesis of Fe@Fe3C/C Nanocomposites Derived from Bulrush for Excellent Electromagnetic Wave-Absorbing Properties

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

Contact Info

Product

Resources

About

Facile Synthesis of Fe@Fe₃C/C Nanocomposites Derived from Bulrush for Excellent Electromagnetic Wave-Absorbing Properties