Construction of NiCeOx nanosheets-skeleton cross-linked by carbon nanotubes networks for efficient electromagnetic wave absorption

In this work, two-dimensional NiCeOx nanosheet-modified carbon nanotubes (CNTs) composites were prepared by a hydrothermal method. NiCeOx with different morphologies can be formed by adjusting the addition ratio of nickel salt and cerium salt, and the introduction of CNTs in the subsequent synthe-sis process can effectively prevent the aggregation of NiCeOx nanosheets. Microstructural studies show that hexagonal NiCeOx nanosheets with a size of 100 nm are uniformly intertwined with CNTs. When ap-plied to the attenuation of electromagnetic waves, NiCeOx/CNTs composites exhibit better electromagnetic wave (EMW) absorption performance than pure CNTs and NiCeOx nanosheets due to improved impedance matching and multiple polarization relaxation. At the matching thickness of 1.9 mm, the composite ex-hibits a minimum reflection loss (RLmin) of -53.2 dB and an effective absorption bandwidth (RL < -10 dB) of 5.04 GHz with a thickness of 2.3 mm. These results indicate that the as-prepared NiCeOx/CNTs composites have excellent EMW absorption performance and are expected to be a candidate material for EMW absorption.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

In this study, two-dimensional NiCeOx nanosheet-modified carbon nanotubes (CNTs) composites were prepared via hydrothermal method. The addition ratio of nickel salt and cerium salt was adjusted to form NiCeOx with different morphologies, and the introduction of CNTs effectively prevented the aggregation of NiCeOx nanosheets. Microstructural analysis revealed that hexagonal NiCeOx nanosheets with a size of 100 nm were uniformly intertwined with CNTs. The NiCeOx/CNTs composites exhibited superior electromagnetic wave absorption performance compared to pure CNTs and NiCeOx nanosheets, attributed to improved impedance matching and multiple polarization relaxation.