Mixed-dimensional hierarchical configuration of 2D Ni2P nanosheets anchored on 1D silk-derived carbon fiber for extraordinary electromagnetic wave absorption

Abstract

• Mixed-dimensional hierarchical of 2D Ni 2 P nanosheets anchored on 1D silk-derived carbon fiber composites were prepared. • A minimum reflection loss of −56.9 dB and a broad effective bandwidth of 7.2 GHz with 20 wt% filling ratios were achieved. • Ni 2 P not only shows remarkable dielectric characteristic and EMW absorption ability, but also denote to dual-conductive loss and polarization relaxation loss. Considering a series of electromagnetic pollution problems brought by the development of electronic communication technology, more attention has been paid to the research of electromagnetic wave (EMW) absorbing materials with unique composition and structure. Herein, under the inspiration of mixed-dimensional hierarchical structure, 2D Ni 2 P nanosheets anchored on 1D silk-derived carbon fiber is successfully fabricated as a gratifying resistor-dielectric type absorber. By a controllable pyrolyzation strategy and disproportionated reaction, high-density 2D Ni 2 P nanosheets were grown vertically and cross-linked on the surface of 1D silk-derived carbon fiber. The sample exhibited superior EMW absorption performance with maximum reflection loss value of – 56.9 dB at the thickness of 2.32 mm and the effective absorption bandwidth can reach to 7.2 GHz at the thickness of 1.93 mm. In addition, the pure Ni 2 P shows remarkable dielectric characteristic and EMW absorption ability as well. The integration of dual-conductive loss, enhanced polarization relaxation loss and the multiple scattering in the composites was proved to contribute to the good EMW absorption performance. Therefore, this work confirms the great potentials of Ni 2 P as a high-efficient EMW absorbing materials and light a new way in construction of multidimensional absorber.