Facile synthesis of BN/Ni nanocomposites for effective regulation of microwave absorption performance.

In this work, a series of BN/Ni nanocomposites were synthesized via a facile in-situ synthesis process for efficiency electromagnetic wave absorption (EWA). The incorporation of the insulative BN could not only reduce the size of Ni particles and prevent them from agglomeration, but also optimize the conductivity and impedance matching behaviours of the hybrids. Meanwhile, the large interface area of the hybrids facilitated the high-frequency polarization effect and contributed to the enhanced EWA performance. As a result, when the BN/Ni filler content was 48 wt%, the bandwidth for the relection loss (RL) values below −10 dB achieved in a wide frequency range of 12.7–15.7 GHz with a thickness of 1.7 mm, which meets the demand of wideband and efficiency characters of EWA materials. By considering both the structural design and electromagnetic regulation, it is expected that the as-fabricated BN/Ni hybrid can be a promising candidate as highly effective electromagnetic wave absorbing material. Image 1 • BN/Ni composites with abundant heterogeneous interface were synthesized. • The conductivity of BN/Ni composites could be adjusted by insulative BN. • Improved impedance matching contributed to the dissipation of microwave. • The effective bandwidth can reach 3.0 GHz with a thickness of 1.7 mm. [ABSTRACT FROM AUTHOR]