Achieving tunability of effective electromagnetic wave absorption between the whole X-band and Ku-band via adjusting PPy loading in SiC nanowires/graphene hybrid foam

“…To evaluate the performance of the as-obtained EMAMs, the RL values in the frequency of 1-18 GHz were calculated on the basis of transmission line theory, which was depicted by Eqs. ( 1) and ( 2) [49][50][51][52][53][54][55][56][57][58][59][60][61][62]:…”

Section: Electromagnetic Measurementsmentioning

confidence: 99%

Structural Engineering of Hierarchical Aerogels Comprised of Multi-dimensional Gradient Carbon Nanoarchitectures for Highly Efficient Microwave Absorption

et al. 2021

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Recently, multilevel structural carbon aerogels are deemed as attractive candidates for microwave absorbing materials. Nevertheless, excessive stack and agglomeration for low-dimension carbon nanomaterials inducing impedance mismatch are significant challenges. Herein, the delicate “3D helix–2D sheet–1D fiber–0D dot” hierarchical aerogels have been successfully synthesized, for the first time, by sequential processes of hydrothermal self-assembly and in-situ chemical vapor deposition method. Particularly, the graphene sheets are uniformly intercalated by 3D helical carbon nanocoils, which give a feasible solution to the mentioned problem and endows the as-obtained aerogel with abundant porous structures and better dielectric properties. Moreover, by adjusting the content of 0D core–shell structured particles and the parameters for growth of the 1D carbon nanofibers, tunable electromagnetic properties and excellent impedance matching are achieved, which plays a vital role in the microwave absorption performance. As expected, the optimized aerogels harvest excellent performance, including broad effective bandwidth and strong reflection loss at low filling ratio and thin thickness. This work gives valuable guidance and inspiration for the design of hierarchical materials comprised of dimensional gradient structures, which holds great application potential for electromagnetic wave attenuation. "Image missing"

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“…The electromagnetic absorption of the composites at various thicknesses was achieved based on the measured complex permittivity. Therefore, the reflection loss (R L ) can be calculated as [42][43][44][45]:…”

Section: Electromagnetic Absorption Performancementioning

confidence: 99%

“…Specially, the SiC nanowires are coated by a surface carbon layer (green zone in Fig. 2f), which may enhance the functionability of the SiC-NW/C composite [42,43]. In addition to SiC nanowires, carbon clusters are also observed in the low-magnification TEM image (Fig.…”

Section: Morphology Comparisonmentioning

confidence: 99%

Controllable conversion of rice husks to Si/C and SiC/C composites in molten salts

Pang

Weng

Zhou

et al. 2021

Journal of Energy Chemistry

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Achieving tunability of effective electromagnetic wave absorption between the whole X-band and Ku-band via adjusting PPy loading in SiC nanowires/graphene hybrid foam

Cited by 131 publications

References 47 publications

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

Structural Engineering of Hierarchical Aerogels Comprised of Multi-dimensional Gradient Carbon Nanoarchitectures for Highly Efficient Microwave Absorption

Controllable conversion of rice husks to Si/C and SiC/C composites in molten salts

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