Abstract
The surface coating of magnetic nanoparticles onto hollow glass microspheres (HGMs) is of vital importance as light-weighted powders with wave-absorbing properties. In this study, HGMs were successfully coated by Co/Ni nanoparticles through a four-stepped strategy of NaF + HCl roughening, NaOH washing, PdCl2 activation, and electroless plating, successively. The soft roughening of SiO2 with NaF and the post-washing of Na2SF6 byproducts with NaOH were validated to ensure the integrity of the as-coated HGMs. The Ni–Co–P alloy coatings were measured to be lower than 1 μm in thickness with nanoparticles of 100–200 nm in diameter. The reflection loss of HGMs coated by 30 wt% Ni/Co not only retained the peak of the Co coating (− 4.5 dB) but also reached about − 6.7 dB at 16.4 GHz, much higher than that of HGMs coated by Ni and Co. The overall trend of input and output impedance ratio of the sample coated by Ni/Co does not change significantly compared with HGMs coated by Co, but the impedance matching has been optimized compared with Ni-plated powders. The novel light material with a uniform and complete coating prepared in this paper provides a new idea for the modification of HGMs for multi-functional applications.
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The datasets generated during and/or analyzed during the current study are not publicly available but are available from the corresponding author upon reasonable request
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Acknowledgements
The authors would like to thank Anhui Province Major Projects of Science and Technology (2021e020005) for the financial support.
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Funding was provided by Major Science and Technology Projects in Anhui Province (2021e020005).
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All authors contributed to the conception and study of this paper. Material preparation, performance testing, and data analysis were performed by HH, PS, and FB. LL, YL, CX, and JZ provided technical knowledge. The first draft of the manuscript was written by HH, and the final version of the manuscript was revised with the help of all authors.
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Huang, H., Song, P., Bu, F. et al. Facile surface coating of Ni–Co–P alloy particles on hollow glass microspheres for enhanced wave absorbing. J Mater Sci: Mater Electron 33, 17011–17022 (2022). https://doi.org/10.1007/s10854-022-08579-x
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DOI: https://doi.org/10.1007/s10854-022-08579-x