Nanocellulose-polysilazane single-source-precursor derived defect-rich carbon nanofibers/SiCN nanocomposites with excellent electromagnetic absorption performance

Liu, Xingmin; Li, Minghang; Liu, Heqiang; Duan, Wenyan; Fasel, Claudia; Chen, Yongchao; Qu, Fangmu; Xie, Wenjie; Fan, Xiaomeng; Riedel, Ralf; Weidenkaff, Anke

doi:10.1016/j.carbon.2021.11.058

Cited by 19 publications

(11 citation statements)

References 37 publications

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“…In general, the polarization relaxation process in microwave absorbing materials can be described by the Cole-Cole curves. According to Debye polarization relaxation, the relationship between ε′ and ε″ is as follows 13,30,31 :…”

Section: Electromagnetic Wave Absorption Propertiesmentioning

confidence: 99%

“…The flight speed of hypersonic aircraft is constantly increasing, and the service environment is becoming increasingly harsh. In order to maintain the aircraft aerodynamic characteristics and flight safety, the microwave absorbing ceramics have better oxidation resistance and high temperature performance which can meet the application requirements of high temperature stealth 13–15 …”

Section: Introductionmentioning

confidence: 99%

“…In order to maintain the aircraft aerodynamic characteristics and flight safety, the microwave absorbing ceramics have better oxidation resistance and high temperature performance which can meet the application requirements of high temperature stealth. [13][14][15] Polymer-derived ceramics (PDCs) are obtained through the pyrolysis of polymer ceramic precursor; they exhibit both the good technological properties of polymers and the numerous advantages of ceramic materials, such as high strength, high temperature resistance, and corrosion resistance. 16 Based on these advantages, they have been widely used in high temperature sensors, ceramic fibers, energy storage materials, and ceramic matrix composites.…”

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confidence: 99%

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Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

You

Han

Tian

et al. 2023

Int J Applied Ceramic Tech

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Polymer‐derived ceramic materials exhibit adjustable composition, microstructure, and dielectric properties and are widely used as high temperature microwave absorption materials in the aerospace field. In this study, polymer‐derived SiCN ceramic aerogels with excellent electromagnetic wave absorption (EMA) properties were successfully fabricated through a combination of the sol‐gel, freeze‐ drying, and polymer precursor conversion methods. The hydrosilylation reaction between the Si‐H bond in polysilazane (a polymer ceramic precursor) and the C = C bond in divinylbenzene (a cross‐linking agent) occurs to form a wet gel. The effects of the molar ratios of the two bonds (C = C/Si‐H) on the microstructure and EMA properties of the SiCN ceramic aerogels were systematically studied. At a C = C/Si–H molar ratio of 1.25:1, the minimum reflection loss of the SiCN ceramic aerogels is −37.57 dB at 10.88 GHz. Moreover, the corresponding effective absorption bandwidth covers almost the entire X‐band, showing excellent EMA properties.

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Section: Electromagnetic Wave Absorption Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

You

Han

Tian

et al. 2023

Int J Applied Ceramic Tech

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“…In the previous work, different shapes of PDC powders, 10–12 fibers, 13–15 aerogels, 16–22 bulk, 23,24 and metamaterials 25 can be prepared owing to the availability of well‐established thermoplastic shaping techniques. Furthermore, the flexible designability of ceramic polymer molecules affords not only binary, 26 ternary, 10,27 and quaternary 24,28 ceramics but also a wide variety of multicomponent compounds 23,29–34 …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the flexible designability of ceramic polymer molecules affords not only binary, 26 ternary, 10,27 and quaternary 24,28 ceramics but also a wide variety of multicomponent compounds. 23,[29][30][31][32][33][34] PDC aerogels are currently attractive prospects that have been the focus of numerous studies due to their low density and high porosity. 35 The 3D porous structures impart multiple internal scattering, further capturing, and attenuating microwaves.…”

Section: Introductionmentioning

confidence: 99%

Bridged polysilsesquioxane‐derived SiOCN ceramic aerogels for microwave absorption

Shao

Ding

et al. 2022

J Am Ceram Soc.

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The development of high‐performance microwave absorption materials in harsh environment is highly desirable but challenging. Herein, lightweight silicon oxycarbonitride (SiOCN) ceramic aerogels were fabricated by the pyrolysis of bridged polysilsesquioxane aerogels, which was presynthesized by a sol–gel method followed by vacuum drying. The structural order and content of free carbon phase determined by pyrolysis temperature play a critical role in modulating the impedance matching and attenuation capacity. The as‐prepared SiOCN aerogel pyrolyzed at 1000°C achieves a minimal reflection loss of −64.2 dB at 8.96 GHz and a broad bandwidth of 5.4 GHz at a low thickness of 2.15 mm. The hierarchical pore structure, abundant heterogeneous amorphous SiOCN/free carbon interfaces, and conductive free carbon phase benefit the superior absorption performance by forming good impedance matching, multiple scattering, interface polarization, and conduction losses. This work provides an insight for the rational design of polymer‐derived ceramic aerogel‐based microwave absorption materials for potential application under extreme conditions such as high‐temperature and oxidation environments.

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Structural Electromagnetic Absorber Based on MoS₂/PyC‐Al₂O₃ Ceramic Metamaterials

Liu

et al. 2023

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Limited by the types of suitable absorbents as well as the challenges in engineering the nanostructures (e.g., defects, dipoles, and hetero‐interface) using state‐of‐the‐art additive manufacturing (AM) techniques, the electromagnetic (EM) wave absorption performance of the current ceramic‐based materials is still not satisfying. Moreover, because of the high residual porosity and the possible formation of cracks during sintering or pyrolysis, AM‐formed ceramic components may in many cases exhibit low mechanical strength. In this work, semiconductive MoS2 and conductive PyC modified Al2O3 (MoS2/PyC‐Al2O3) ceramic‐based structural EM metamaterials are developed by innovatively harnessing AM, precursor infiltration and pyrolysis (PIP), and hydrothermal methods. Three different meta‐structures are successfully created, and the ceramic‐based nanocomposite benefit from its optimization of EM parameters. Ultra‐broad effective absorption bandwidth (EAB) of 35 GHz is achieved by establishment of multi‐loss mechanism via nanostructure engineering and fabrication of meta‐structures via AM. Due to the strengthening by the PyC phase, the bending strength of the resulting ceramics can reach ≈327 MPa, which is the highest value measured on 3D‐printed ceramics of this type that has been reported so far. For the first time, the positive effect deriving from the engineering of the microscopic nano/microstructure and of the macroscopic meta‐structure of the absorber on the permittivity and EM absorption performance is proposed. Integration of outstanding mechanical strength and ultra‐broad EAB is innovatively realized through a multi‐scale design route. This work provides new insights for the design of advanced ceramic‐based metamaterials with outstanding performance under extreme environment.

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Nanocellulose-polysilazane single-source-precursor derived defect-rich carbon nanofibers/SiCN nanocomposites with excellent electromagnetic absorption performance

Cited by 19 publications

References 37 publications

Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

Bridged polysilsesquioxane‐derived SiOCN ceramic aerogels for microwave absorption

Structural Electromagnetic Absorber Based on MoS₂/PyC‐Al₂O₃ Ceramic Metamaterials

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Nanocellulose-polysilazane single-source-precursor derived defect-rich carbon nanofibers/SiCN nanocomposites with excellent electromagnetic absorption performance

Cited by 19 publications

References 37 publications

Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

Excellent electromagnetic wave absorption properties of SiCN ceramic aerogels via a controlled hydrosilylation reaction

Bridged polysilsesquioxane‐derived SiOCN ceramic aerogels for microwave absorption

Structural Electromagnetic Absorber Based on MoS2/PyC‐Al2O3 Ceramic Metamaterials

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Structural Electromagnetic Absorber Based on MoS₂/PyC‐Al₂O₃ Ceramic Metamaterials