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Direct large-scale fabrication of C-encapsulated B4C nanoparticles with tunable dielectric properties as excellent microwave absorbers
- Ma, Mengdong, Yang, Ruilong, Zhang, Can, Wang, Bochong, Zhao, Zhisheng, Hu, Wentao, Liu, Zhongyuan, Yu, Dongli, Wen, Fusheng, He, Julong, Tian, Yongjun
- Carbon 2019 v.148 pp. 504-511
- X-ray diffraction, absorption, carbon, ceramics, dielectric properties, nanoparticles
- Composites that consist of ceramic and C materials have attracted considerable attention in the microwave absorption field. In this work, we applied a facile and scalable synthesis strategy to prepare B4C nanoparticles with core–shell structures. XRD and Raman results confirmed the existence of B4C and amorphous C in the core–shell B4C nanoparticles. Morphological analysis revealed that the B4C nanoparticles exhibited regular morphologies with average diameter of approximately 100 nm and were well encapsulated by amorphous C shells. The C-coated B4C nanoparticles fabricated with a B/C ratio of 1:1.25 and with thicknesses of 1.5 mm provided the lowest reflection loss value of −60.8 dB at 15.5 GHz. The C coated B4C nanoparticles have considerable potential uses as microwave absorbers given their facile preparation and excellent microwave absorption performance.