Three-dimensional boron, nitrogen co-doped carbon nanotubes encapsulated with nickel nanoparticles (3D Ni@BNCNTs) composite have been prepared by a simple pyrolysis process using flower-like Ni₂B alloy nanosheets (Ni₂B NS) as catalyst. This technique enables one-step regulation of the growth diameter and structure of CNTs as well as in situ doping of B atoms. The doping of B and N atoms generates dipolar polarization and increases the dielectric loss. The prepared 3D Ni@BNCNTs samples exhibit excellent electromagnetic wave absorption capacity due to the abundant interface polarization, rich defective polarization, good conduction loss and good magnetic loss synergistically. 3D Ni@BNCNTs has a minimum reflection loss of −63.7 dB with a matching thickness of 1.7 mm and a broad effective absorption bandwidth which can reach 4.56 GHz at 1.5 mm with the merely filler loading ratio of 20 wt%. Therefore, this work developed a promising electromagnetic wave absorber for ultra-lightweight, ultra-thin and high-efficiency.

使用花状 Ni ₂ B 合金纳米片 (Ni ₂B NS) 作为催化剂。该技术能够一步调节 CNT 的生长直径和结构以及 B 原子的原位掺杂。B和N原子的掺杂会产生偶极极化并增加介电损耗。由于丰富的界面极化、丰富的缺陷极化、良好的传导损耗和良好的磁损耗协同作用，制备的 3D Ni@BNCNTs 样品表现出优异的电磁波吸收能力。3D Ni@BNCNTs 的最小反射损耗为 -63.7 dB，匹配厚度为 1.7 mm，在 1.5 mm 处可达到 4.56 GHz 的宽有效吸收带宽，仅填料负载率为 20 wt%。因此，本工作开发了一种有前途的超轻、超薄和高效电磁波吸收器。