Boron nitride nanosheets decorated N-doped carbon nanofibers as a wide-band and lightweight electromagnetic wave absorber

Carbon nanofibers are widely used for electromagnetic wave (EMW) absorption. However, it is still worthy attention for rationally optimizing their permittivity. Herein, a satisfactory EMW absorber of few-layer BN nanosheets decorated N-doped carbon nanofibers (BNNS-CNFs) was successfully prepared by electrospinning-assisted synthetic technology. The permittivity of CNFs can be adjusted by introducing of BNNS and N doped in carbon matrix. As a EMW absorber, BNNS-CNFs/paraffin hybrid with a low filling ratio of 10 wt% shows excellent absorption performances. The minimum reflection loss (RL) is about -58.41 dB at a thickness of 1.6 mm and the widest absorption bandwidth (RL < -10 dB) of 5.76 GHz can be obtained at 1.75 mm. The significant enhancement of EMW absorption performance is mainly attributed to the improvement of impedance match and multiple polarizations after introduction of BNNS and more defects by N-doped. Thus, BNNS-CNFs with lightweight and wide-band at low load content would be utilized as a high-efficiency EMW absorber. (c) 2021 Elsevier B.V. All rights reserved.