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Synergistic influence of micropore architecture and TiO2 coating on the microwave absorption properties of Co nanoparticles

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Abstract

Microporous Co@TiO2 nanoparticles (NPs) have been synthesized by combining chemical de-alloying and sol–gel strategies. The NPs with a mean size of 30 nm display a TiO2 shell of 5 nm in thickness and possess micropores in a range from 0.4 to 0.8 nm. The saturation magnetization (MS) and coercivity (HC) of the NPs are 18.6 emu/g and 337.4 Oe, respectively. The microwave absorption properties of the microporous Co@TiO2 NPs mixed with paraffin were investigated in the range of 2–18 GHz. Due to the relatively high dielectric loss tangent value and low magnetic loss tangent value, the impedance matching of the composite is better than the nonporous counterpart. The composite shows a minimum reflection loss (RL) of − 16.6 dB at a thickness of merely 2.2 mm, and the absorption bandwidth for RL ≤ − 10 dB is as large as 5.0 GHz. At a thickness of 1.9 mm, the maximum absorption bandwidth for RL ≤ − 10 dB of 6.8 GHz can be obtained, which is much larger than that of its nonporous counterpart. Furthermore, the microwave absorption mechanism is discussed on the basis of the synergistic influence of micropores and TiO2 shell. This study provides a good reference for designing novel materials for electromagnetic interference applications.

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Acknowledgements

The authors acknowledge the support of this work by the Joint Fund of the National Natural Science Foundation of China and Baosteel Group Corporation (No. U1560106), the Aeronautical Science Foundation of China (No. 2016ZF51050) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry).

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  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, China

    Haoyan Liao, Yu Pang, Da Li & Tong Liu

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Liao, H., Pang, Y., Li, D. et al. Synergistic influence of micropore architecture and TiO2 coating on the microwave absorption properties of Co nanoparticles. J Mater Sci: Mater Electron 30, 5620–5630 (2019). https://doi.org/10.1007/s10854-019-00855-7

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