Tunable microwave absorptivity in reduced graphene oxide functionalized with Fe3O4 nanorods

Zhang, Qiancheng; Du, Zuojuan; Huang, Xiaozhong; Zhao, Zixiang; Guo, Tong; Zeng, Guoxun; Yu, Yantao

doi:10.1016/j.apsusc.2018.12.130

Cited by 71 publications

(14 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 5(a), some μ' values are less than 1.0 in higher frequency region, which also appeared in some nanostructure magnetic materials [9,16,26,28,37]. The enlarged surface area of the nanostructures could result in more eddy current on the surface, which would give rise to anti-magnetism accompanied with decrease of the real permeability [38].…”

Section: Permittivity and Permeabilitymentioning

confidence: 94%

“…However, applications of Fe3O4 are still limited because of its high mass fraction in absorbers although many methods (such as composites with conductors and nanostructure preparation) are employed to improve the conductivity and microwave absorbing ability [8][9][10][26][27][28][29]. Compared with composites with conductors, Fe3O4 with nanostructures showed significant superiorities, including simple preparation process, single component, chemical stability and low cost.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

et al. 2020

View full text Add to dashboard Cite

Although Fe 3 O 4 particles have exhibited excellent microwave absorbing capacity and widely used in practical application due to the synergistic effect of magnetic loss and dielectric loss, their applications are still limited for the required high mass fraction in absorbers. To overcome this problem, the development of Fe 3 O 4 materials with low dimensional structures is necessary. In this study, the shape anisotropic Fe 3 O 4 nanotubes (NTs) with low mass ratios were applied to realize efficient microwave absorption. The NTs with different aspect ratios were prepared through facile electrospinning followed by two-step thermal treatments and mechanical shearing. The cross-linked nanotubular structure enabled the absorbers to have much higher electrical conductivity, multiple scattering, polarization relaxation and better anti-reflection surface, while the shape anisotropic NTs maintained significant multiple resonances with stronger coercivity. These all were beneficial to microwave absorption with enhanced dielectric loss, magnetic loss and sterling impedance matching. Results showed that the absorber with 33.3 wt.% of short Fe 3 O 4 NTs had minimum reflection loss of −58.36 dB at 17.32 GHz with a thickness of 1.27 mm, and had the maximum effective absorbing bandwidth (EAB) of 5.27 GHz when the thickness was 1.53 mm. The absorber with 14.3 wt.% of long Fe 3 O 4 NTs presented the widest EAB in certain radar band with attenuated 80.75% X band and 85% Ku band energy bellow −10 dB at the thickness of 2.65 and 1.53 mm, respectively. This study provided an approach for the development of shape anisotropic magnetic absorbing materials, and broadened their practical applications as magnetic absorbers.

show abstract

Section: Permittivity and Permeabilitymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Exactly as the previous analysis, the higher the temperature, the larger the S BET and the more internal pores of the material. Herein, according to Maxwell–Wagner polarization theory, plentiful pores yield enough heterogeneous solid–void interfaces to drive masses of free charges accumulation; subsequently, interfacial polarization occurs and the resulting polarized charges make a great contribution to the enhancement of dielectric parameters. , When loading an alternating electric field, free charges would follow the variation and hop repeatly between heterointerfaces provided by pores or doped N atoms; then an interfacial polarization relaxtion would occur and have some effect to dissipate incident microwave . Apart from interfacial polarization, higher porosity promotes multiple reflection and scattering and further consumes the incident wave to a great extent.…”

Section: Resultsmentioning

confidence: 99%

Inherent N-Doped Honeycomb-like Carbon/Fe₃O₄ Composites with Versatility for Efficient Microwave Absorption and Wastewater Treatment

Xiao

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

To our knowledge, the utilization of chitosan-derived materials in microwave absorbing is currently scarce. Herein, for the first time, by fully exploiting its potential properties via facile means, chitosan was employed as the exclusive joint source of carbon and nitrogen, and the inherent N-doped honeycomb-like carbon/Fe3O4 composites with favorable versatility that can efficiently treat microwave interference and even wastewater pollution were controllably prepared. The optimal microwave absorbency is attractive, of which the minimum reflecting loss reaches to −59.5 dB, and the maximum effective absorbing bandwidth is 5.36 GHz when filler content is only 10%. Beyond the major trying, another function for wastewater treatment was also demonstrated by excellent toxic Cr(VI) adsorption and peroxymonosulfate activation for organic pollutants (azo-dye Orange II) degradation. More significantly, the embedding magnetic component makes it convenient to be magnetically separated from the testing solution. Totally, these N-doped honeycomb-like carbon/Fe3O4 composites with versatility prepared by simple methods not only open a new road for the diversified utilization of chitosan but also would possibly make a referrable guidance to the design or even synthesis for superior microwave absorption and environmental remediating materials.

show abstract

“…d) Minimum reflection loss of FNFs, FNFs/CNT, FNF@PPy, and previously reported Fe 3 O 4 -based absorbents. [2,20,23,35,36,40,46,[59][60][61] e) EABs of FNFs, FNFs/CNT, and FNF@PPy in S and C radar bands.…”

Section: Reflection Lossmentioning

confidence: 99%

“…However, 2D conductive materials in the composites always presented higher percolation thresholds than 1D materials, which meant limited conductance loss and lower microwave attenuation. [24] Combination with other dielectric materials [35][36][37][38][39] and surface modification of conductive polymers [40][41][42] was commonly used to optimize and modulate the microwave attenuation of Fe 3 O 4 particles. As a typical conductive carbon material, CNTs in the absorber worked as cross-linkers could bridge every component into a conductive network structure.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Absorption of Shape Anisotropic Fe₃O₄ Nanoflakes and Their Composites

et al. 2021

View full text Add to dashboard Cite

As a widely applied microwave absorbing material, Fe3O4 with various nanostructures has been extensively studied to further satisfy the practical applications. Herein, uniform Fe3O4 nanoflakes (FNFs) are synthesized by electrospinning and subsequent thermal treatment. The absorbers filled with 30 wt% FNFs (thickness: 1.5 mm) show superior reflection loss (RL) of −60.26 dB at 15.20 GHz due to the hierarchically cross‐linked conductive network and shape anisotropy. Furthermore, the FNFs composited with carbon nanotube (FNFs/CNT) and coated with polypyrrole (FNF@PPy) are prepared by direct mixing and vapor‐phase polymerization, respectively, to optimize the microwave absorption. Fast carrier mobility and enlarged interfacial area are realized to enhance electrical conductance and polarization loss. FNFs/CNT present multiple RL peaks of −50.9, −54.3, and −45.1 dB at 3.38, 6.70, and 12.65 GHz, respectively. Meanwhile, FNF@PPy shows wider effective absorbing bandwidths at low‐frequency of C‐band (2.32 GHz, 5.68–8.0 GHz) and S‐band (1.02 GHz, 2.79–3.81 GHz). This study confirms the considerable microwave absorbing performances of FNFs and their composites, and provides candidates for different potential applications in microwave absorption.

show abstract

Tunable microwave absorptivity in reduced graphene oxide functionalized with Fe3O4 nanorods

Cited by 71 publications

References 49 publications

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

Inherent N-Doped Honeycomb-like Carbon/Fe₃O₄ Composites with Versatility for Efficient Microwave Absorption and Wastewater Treatment

Enhanced Microwave Absorption of Shape Anisotropic Fe₃O₄ Nanoflakes and Their Composites

Contact Info

Product

Resources

About

Tunable microwave absorptivity in reduced graphene oxide functionalized with Fe3O4 nanorods

Cited by 71 publications

References 49 publications

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

Shape anisotropic Fe3O4 nanotubes for efficient microwave absorption

Inherent N-Doped Honeycomb-like Carbon/Fe3O4 Composites with Versatility for Efficient Microwave Absorption and Wastewater Treatment

Enhanced Microwave Absorption of Shape Anisotropic Fe3O4 Nanoflakes and Their Composites

Contact Info

Product

Resources

About

Inherent N-Doped Honeycomb-like Carbon/Fe₃O₄ Composites with Versatility for Efficient Microwave Absorption and Wastewater Treatment

Enhanced Microwave Absorption of Shape Anisotropic Fe₃O₄ Nanoflakes and Their Composites