Laminated microwave absorbers of A-site cation deficiency perovskite La0.8FeO3 doped at hybrid RGO carbon

Jia, Zirui; Gao, Zhenguo; Feng, Ailing; Zhang, Yi; Zhang, Chuanhui; Nie, Guozheng; Wang, Kuikui; Wu, Guanglei

doi:10.1016/j.compositesb.2019.107246

Cited by 124 publications

(18 citation statements)

References 62 publications

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“…Wave-absorbing materials can effectively absorb incident electromagnetic waves, converting them into heat or other energy, and have received extensive attention [5,6] . Wave-absorbing materials are usually composed of matrix materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and investigation on ternary heterogeneous MWCNT@TiO2-C fillers and their silicone rubber wave-absorbing composites

Zhao

Zhang

Wang

et al. 2020

Composites Part A: Applied Science and Manufacturing

144

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Ternary heterogeneous MWCNT@TiO 2-C wave absorbent was firstly prepared, using glucose, MWCNT, and titanium isopropoxide as raw materials, through the solvothermal process followed by post-heat treatment. Afterwards, MWCNT@TiO 2-C/silicone rubber wave-absorbing composites were fabricated via solution casting and subsequent curing process. XRD, Raman, XPS, and TEM analyses demonstrated the MWCNT@TiO 2-C fillers were successfully synthesized with TiO 2 and amorphous carbon coated on the surface of MWCNT. When the MWCNT@TiO 2-C/silicone rubber wave-absorbing composites contained 25 wt% MWCNT@TiO 2-C fillers and with the thickness of 2.5 mm, it displayed the minimum reflection loss of-53.2 dB and an effective absorption bandwidth of 3.1 GHz. Remarkable wave-absorbing performances for MWCNT@TiO 2-C/silicone rubber composites could be attributed to the synergetic effect of interfacial polarization loss and conduction loss.

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Section: Introductionmentioning

confidence: 99%

Fabrication and investigation on ternary heterogeneous MWCNT@TiO2-C fillers and their silicone rubber wave-absorbing composites

Zhao

Zhang

Wang

et al. 2020

Composites Part A: Applied Science and Manufacturing

144

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“…The relative complex permittivity can be expressed by the following relation [ 47 ]:

where f , ε ∞ , ε s and τ corresponds to frequency, optical and stationary dielectric constant and polarization relaxation time, respectively. The dielectric parameters ( ε ’, ε ″) can be evaluated by the following relation [ 48 , 49 ]:

where σ ,

and

corresponds to electrical conductivity, polarization loss and conductive loss, respectively.…”

Section: Resultsmentioning

confidence: 99%

Excellent, Lightweight and Flexible Electromagnetic Interference Shielding Nanocomposites Based on Polypropylene with MnFe2O4 Spinel Ferrite Nanoparticles and Reduced Graphene Oxide

et al. 2020

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In this work, various tunable sized spinel ferrite MnFe2O4 nanoparticles (namely MF20, MF40, MF60 and MF80) with reduced graphene oxide (RGO) were embedded in a polypropylene (PP) matrix. The particle size and structural feature of magnetic filler MnFe2O4 nanoparticles were controlled by sonochemical synthesis time 20 min, 40 min, 60 min and 80 min. As a result, the electromagnetic interference shielding characteristics of developed nanocomposites MF20-RGO-PP, MF40-RGO-PP, MF60-RGO-PP and MF80-RGO-PP were also controlled by tuning of magnetic/dielectric loss. The maximum value of total shielding effectiveness (SET) was 71.3 dB for the MF80-RGO-PP nanocomposite sample with a thickness of 0.5 mm in the frequency range (8.2–12.4 GHz). This lightweight, flexible and thin nanocomposite sheet based on the appropriate size of MnFe2O4 nanoparticles with reduced graphene oxide demonstrates a high-performance advanced nanocomposite for cutting-edge electromagnetic interference shielding application.

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“…Both the real and imaginary parts decrease with an increase in frequency, indicating a frequency dispersion behavior induced by the enhanced polarization lagging in the high frequency [46,47]. The dielectric behaviors of McM@rGO majorly originate from the interfaces between nanoparticles and graphene layers as well as the polarization of residual functional groups [48]. Benefitting from the uniform hybridization between sea-islandlike McM and rGO layers, McM@rGO-600 displays an improvement in dielectric dissipation in the range of 9-14 GHz as described by dielectrical dissipation factors (tan δε) in Figure 5(c).…”

Section: Considering the Intrinsic Ferromagnetism Of Nife 2 O 4 Fenmentioning

confidence: 99%

Improved impedance matching by multi-componential metal-hybridized rGO toward high performance of microwave absorption

Xie

Jiang

et al. 2021

Nanotechnology Reviews

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Microwave-absorbing materials with good microwave absorption performance are of great interest for military applications and human health, which is threatened by electromagnetic radiation pollution. Herein, the design and synthesis of multi-componential metal-hybridized graphene composites via freeze drying and pyrolysis of ferrocene hydrazone complex precursor are reported. Various magnetic nanoparticles are loaded on reduced graphene oxide (rGO) via controlling their pyrolysis temperature. The complex electromagnetic parameters of these hybrids are therefore regulated by the hybrid components. Among them, rGO hybridized by the sea-island-like Fe2O3/Fe3O4/FeNi3 multi-componential metals shows a good balance of dielectric and magnetic constants. Thus, the improved impedance matching with free space brings about a superior electromagnetic wave absorption performance, especially on the effective absorption bandwidth. The minimum reflection loss (RL) of the hybrids is as low as −40.3 dB at 11 GHz with the RL bandwidth of −10 dB being 4.55 GHz (from 9.25 to 13.8 GHz).

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Laminated microwave absorbers of A-site cation deficiency perovskite La0.8FeO3 doped at hybrid RGO carbon

Cited by 124 publications

References 62 publications

Fabrication and investigation on ternary heterogeneous MWCNT@TiO2-C fillers and their silicone rubber wave-absorbing composites

Fabrication and investigation on ternary heterogeneous MWCNT@TiO2-C fillers and their silicone rubber wave-absorbing composites

Excellent, Lightweight and Flexible Electromagnetic Interference Shielding Nanocomposites Based on Polypropylene with MnFe2O4 Spinel Ferrite Nanoparticles and Reduced Graphene Oxide

Improved impedance matching by multi-componential metal-hybridized rGO toward high performance of microwave absorption

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