Abstract
In this paper, we synthesized phenolic resin microspheres through the condensation reaction of resorcinol and formaldehyde. Subsequently, lychee-like C@TiO2 microspheres were prepared using a process of hydrolytic coating and high-temperature calcination. Under alkaline hydrolysis conditions, the hydroxyl group of phenolic resin can exist stably and react readily with tetrabutyl titanate to form complexes, and then tetrabutyl titanate can be dispersed uniformly. We evaluated the microwave absorption performance of C@TiO2 composites generated by calcination at different temperatures. The result showed that morphology control can be achieved through temperature regulation, and effective electromagnetic wave absorption in the X, C, and Ku bands can be achieved by adjusting the thickness. The lowest reflection loss (RLmin) is − 34.3dB to − 38.46dB, and the effective absorption bandwidth (EAB) is 2.33 to 4.29 GHz. As a typical semiconductor, TiO2 can effectively adjust the overall dielectric properties of carbon material, which optimizes impedance matching and generates new heterogeneous interfaces, thus improving the wave absorption performance of the composites. In addition, this method has the advantages of easy preparation, low cost, controllable structure, uniform dispersion of coating particles, and environmental friendliness. This makes it a potential microwave absorbing material.
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This work was supported by Basic research expenses Project for Provincial Colleges and Universities (JYG2021001) and Tangshan Science and Technology Planning Project (21130203 C) and Technology Development Project (20230241).
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ZZ, XY and YC: initiated this project and designed the experiments. ZZ and XY: synthesized the samples. ZZ, XY and FZ: characterized the samples and performed the properties measurements. ZZ, XY: wrote the original manuscript. YC: supervised the research and revised the manuscript. All the authors discussed the results.
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Zhang, Z., Yin, X., Zhang, F. et al. Surface morphology modulation and wave-absorbing properties of C@TiO2 composite microspheres. J Mater Sci: Mater Electron 35, 356 (2024). https://doi.org/10.1007/s10854-024-12115-4
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DOI: https://doi.org/10.1007/s10854-024-12115-4