Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

Cao, Fenghui; Jia, Xu; Zhang, Xinci; Li, Bei; Zhang, Xiao; Ouyang, Qiuyun; Zhang, Xitian; Chen, Yujin

doi:10.3390/nano11102636

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…The full process for preparing SiO2-Nx is illustrated in Fig. 1f as follows: according to the Stöber method [27], TEOS was added to DMF while stirring to produce a clear solution. The certain quantity of hydrazine monohydrochloride was then added, and the mixture was agitated for a while.…”

Section: Preparation Of Sio2-nx and P-sio2mentioning

confidence: 99%

Adjusting N-doping to balance conductivity and polarization for superb electromagnetic wave absorption properties of SiO2

Liu

et al. 2023

Preprint

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Due to its low relative permittivity and basically non-electromagnetic loss characteristics, SiO2, a typical electrical insulator, is frequently employed as a wave-transparent material. Hence, using SiO2 as a wave-absorbing material is a novel concept. In this study, a composite (SiO2-Nx) was created using a one-step solvothermal process, doped with N atoms and bound by Si-N bonds. Based on SiO2's imbalanced polarization ability, this research modifies the material's conductivity loss by doping it with N, which successfully balances the polarization and conductivity and turns SiO2-Nx into a wave-absorbing material. The resulting SiO2-N4 composite has a low matched thickness and a wide absorption band of 5.28 GHz with a minimum reflection loss value of -34.48 dB (2.5 mm). The addition of doped-N atoms, which on the one hand improves the impedance matching properties of SiO2-Nx, results in the balanced polarization relaxation and conductivity. The two dielectric loss mechanisms of polarization and conductivity loss, on the other hand, are enhanced to varying degrees by N-doping, which completes the improvement of the wave absorption capability. These outstanding findings offer original suggestions for the creation of SiO2-based electromagnetic wave absorption materials.

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Section: Preparation Of Sio2-nx and P-sio2mentioning

confidence: 99%

Adjusting N-doping to balance conductivity and polarization for superb electromagnetic wave absorption properties of SiO2

Liu

et al. 2023

Preprint

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show abstract

“…On the other hand, it has been widely studied and reported that the effective combination of CNTs and iron oxide can generate prominent EMWA consequence, which because both of them are conducive to the attenuation of EMW through wave absorption and RL. [34][35][36][37][38] Zhang et al [39] had prepared CNTs/iron oxide/polypyrrole/carbon composite via in situ polymerization and the RL min of the composite was À53.07 dB at the frequency of 13.92 GHz with the matching thickness was 2.2 mm, and the effective absorption bandwidth can reach to 6.4 GHz. Peng et al [40] triumphantly fabricated a onedimensional (1D) chain-like composite with berlin bluederived Fe/C anchoring on MCNTs by two simple steps, and the RL min reached to À44.26 dB at 8.32 GHz with the thickness of only 2.4 mm, the corresponding effective absorption bandwidth was about 3.68 GHz.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of porous polyimide fibers with electromagnetic wave absorption properties

Jiang

Lin

Jia

et al. 2022

Polymer Engineering & Sci

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The porous polyimide (PI) composite fibers, which exhibit high-efficiency electromagnetic wave adsorption (EMWA) performance, were successfully fabricated by controlling temperature of the coagulation bath during the wet spinning process. The mechanical properties of composite fiber decreased and average radius of micropores increased gradually with the rise of coagulation bath temperature. In addition, carbon nanotubes (CNTs) and nano-Fe 3 O 4 were introduced into the system by in situ polymerization. CNTs and nano-Fe 3 O 4 contribute to the attenuation of electromagnetic wave (EMW) through microwave absorption and reflection loss (RL), and the porous structure was able to provide multiple reflection paths for incident EMW and achieved higher attenuation. Particularly, when the temperature of coagulation bath was 50 C, the minimum RL (RL min ) value of the PI/CNTs/nano-Fe 3 O 4 (PI/C-Fe) composite fibers was demonstrated to be À54.61 dB with the matching thickness of 2.10 mm. The successful preparation of PI/C-Fe composite fiber in this study pointed out a new direction for the application of PI-based fiber materials in structural EMWA materials.

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New insights into optical properties, and applications of Zr-doped BaTiO3

Reda,

Ateia,

El-Dek

et al. 2024

Appl. Phys. A

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The present work scrutinizes a few uses of barium titanate BaTi1–xZrxO3 (0.0 ≤ x ≤ 0.3) nanoparticles, which are an innovative and highly promising material for a variety of applications, including optical applications; and waste water treatment. To estimate the quality of a synthesized powder relative to an already existing commercial powder, the samples were prepared using cheaper raw materials and simpler, faster procedures than those reported in other literature at lower annealing durations and temperatures. The prepared samples were characterized by field emission scanning electron microscopy (FESEM), and Raman spectroscopy, which confirmed the coarse nature of the samples and the system's tetragonality. Furthermore, UV–visible absorbance of all compositions was studied. It has been determined that optical transition is directly allowed after extensive research, and the optical band gap (Eg) values increase with increasing (Zr4+) ion concentration. The derivation of absorption spectrum fitting (DASF) technique was used to support the type of transition and calculate the value of the coefficient of electronic transition (n). Samples can perform overall water splitting and CO2 reduction processes. The Langmuir and Freundlich isotherms were used to comprehend the procedure of adsorption on the investigated samples. The BaTi0.8Zr0.2O3 has been used to successfully remove 99.9% of heavy metals (Cr6+) from wastewater. The obtained results provide new insights into the control of the structure, and optical behaviors in BaTi1–xZrxO3.

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Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

Cited by 8 publications

References 53 publications

Adjusting N-doping to balance conductivity and polarization for superb electromagnetic wave absorption properties of SiO2

Adjusting N-doping to balance conductivity and polarization for superb electromagnetic wave absorption properties of SiO2

Preparation and characterization of porous polyimide fibers with electromagnetic wave absorption properties

New insights into optical properties, and applications of Zr-doped BaTiO3

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