A synthetic strategy for loading magnetic nanoparticles into boron and nitrogen co-doped nanotubes for high-performance electromagnetic wave absorption

Logical material compositions and ingenious microstructure designs are being embraced as auspicious methods for achieving high-performance electromagnetic wave (EMW) absorbers. Herein, we developed boron and nitrogen co-doped nanotubes using a homogeneous precursor pyrolysis method, with the integration of magnetic Co nanoparticles uniformly dispersed onto the nanotubes. The one-dimensional nanotube microstructure remarkably mitigates the issues associated with magnetic nanoparticle aggregation, thereby enhancing the EMW transport path. Furthermore, the low dielectric constant of the BCN effectively mitigates impedance mismatch. Consequently, upon optimizing the one-dimensional Co@BCN nanotubes, remarkable EMW absorption performance is demonstrated at a filling ratio of 10 wt.%, with an effective absorption bandwidth of 5.33 GHz (1.8 mm) and a minimum reflection loss of −69.3 dB (2.2 mm). Experimental findings and radar cross-section simulations underscore the excellent EMW absorption properties of the prepared one-dimensional Co@BCN nanotubes, culminating in this simple co-doping synthesis strategy serving as a novel approach for fabricating high-performance EMW absorbers.