Controlled reduction synthesis of yolk-shell magnetic@void@C for electromagnetic wave absorption
Introduction
With the rapid development of the wireless communications industry, the frequency of electromagnetic waves in the GHz ranges for absorbent materials has widely been the concern of people [1], [2], [3], [4], [5], [6], [7]. Presently, broadband and high-efficiency electromagnetic wave absorbing materials are used in the industries, commerce, military and other fields, which have important application value [8], [9], [10], [11]. Recently, many workers pay more attention to the magnetic metals or magnetic metal alloys, which have high magnetic loss capability and magnetocrystalline anisotropy [12], [13], [14], [15], [16]. However, the preparation of electromagnetic wave responding materials matched with strong loss and broadband absorption is very difficult, especially at the thin thickness.
In general, absorbing properties are mainly derived from magnetic loss and dielectric loss [17], [18], [19], [20], [21], [22]. However, the impedance matching of a single dielectric or magnetic loss material is weak. In order to design synthetic high-efficiency absorbing materials, magnetic-dielectric composites are a way to broaden the effective absorption bandwidth and to reduce the density of the final composite. Ji and co-workers synthesized hollow carbon@Fe@Fe3O4 nanospheres as a lightweight microwave absorber [23]. Zhao et al prepared hollow porous Ni@SnO2 hybrids with enhanced electromagnetic absorption properties [24]. Xu et al. fabricated metal organic framework-derived Fe/C nanocubes toward efficient microwave absorption [25]. Kuang et al. reported porous Co/C composites with excellent electromagnetic wave absorption properties [26]. As a typical dielectric loss absorbing material, carbon matrix can prove unique conduction loss and boost polarization loss. The combination of magnetic and carbon materials not only improves the impedance matching of the material but also tunes the microwave absorption performance of composites, including the attenuation intensity and response frequency [27], [28], [29], [30].
Herein, yolk-shell magnetic@viod@C were successfully prepared using original a-Fe2O3@PDA as precursor. Controlling the reduction process, magnetic-dielectric Fe3O4@C and Fe@viod@C composites were obtained after an annealing process. Enhancing the microwave dissipation ability and synergistic effect, Fe@void@C exhibited broadband and high-efficiency absorption behaviors than the Fe3O4@C absorber. The minimal reflection loss value of Fe@void@C is −66.5 dB at the absorber thickness only 1.6 mm. Meanwhile, the efficient absorption frequency covers 5.1 GHz from 12.9 to 18 GHz, which covers almost all the Ku-band. Benefiting from the magnetic loss, dielectric loss and synergistic effect, synthesized magnetic-carbon composites display excellent behaviors toward electromagnetic energy conversion. Regulating electromagnetic parameters and microwave loss capability via controlled reduction can provide new ideas for the preparation of high performance electromagnetic wave absorbing materials.
Section snippets
Materials
All reagents applied in this experiment were analytical grade. Iron(III)chloride hexahydrate (FeCl3·6H2O), Sodium citrate (C6H5Na3O7·2H2O), Sodium acetate (CH3COONa) were obtained from Sinopharm Chemical Reagent Co., Ltd. Tin. Tris-buffer solution (pH = 8.5) and dopamine hydrochloride (C8H12ClNO2) was supplied by Aldrich. Deionized water was gained from a Millipore Mill-Q system.
Synthesis of cube-like Fe2O3 particles
Cube-like Fe2O3 particles were fabricated by a hydrothermal method. Initially, a solution consisting of 0.8 mL NaOH
Results and discussion
The detailed synthesis information of yolk-shell Fe@C composites is depicted in Scheme 1. Firstly, cube-like Fe2O3 particles were gained via a solvothermal reaction. After magnetic stirring in the dopamine hydrochloride Tris-buffer solution at room temperature, polydopamine (PDA) coated on the surface of Fe2O3 particles to fabricated the core–shell Fe2O3@PDA composites, which keep the original cube-like morphology. Secondly, the prepared Fe2O3@PDA composites further annealed in the H2/Ar
Conclusion
In summary, magnetic yolk-shell Fe3O4@C and Fe@void@C composites were successfully obtained via controlled reduction strategy, converting the pure semiconductor Fe2O3@PDA precursor to magnetic-carbon composites. Final magnetic@void@C powders exhibited excellent electromagnetic parameters and enhanced microwave absorption loss ability. Inspiringly, the minimal reflection loss (RLmin) value of yolk-shell Fe3O4@C product up to −45.4 dB at the absorber thickness only 1.5 mm and the EABD frequency
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgment
This work was supported by the National Natural Science Foundation of China (Grant No. 51477002).
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