Abstract
As the problems of electromagnetic pollution and interference are becoming increasingly serious, the development of electromagnetic absorption materials with a high absorption capacity and broad absorption bandwidth are stringently needed. In this work, an N-doped 2D carbon/Ni complex is synthesized through direct microwave irradiation on a mixed solution of nickel nitrate, urea, and agarose under N2. The electromagnetic absorption performance can be tuned by controlling the Ni content. Specifically, minimum reflection loss values (RLmin) of −65.5 dB at 15.8 GHz with an effective absorption bandwidth (EAB) of 4.2 GHz at a sample thickness of 1.47 mm, and −55.4 dB at 11.8 GHz with an EAB of 3 GHz at a sample thickness of 1.92 mm can be obtained. The outstanding performance of electromagnetic absorption is attributed to the multiple polarization relaxation processes and the synergistic effect between 2D carbon sheets and Ni particles.
Highlights
Electromagnetic AbsorptionThe rapid development of wireless communication has brought great convenience to people’s lives
The chemical composition of the prepared samples was recorded on X-ray diffractometry (XRD)
With the increase of nickel content, the impendence matching ratio of the material became better (Figure 6c), which was ascribed to the compensation of permeability while the attenuation constant dramatically decreased (Figure 6d), resulting in a poor performance of electromagnetic absorption
Summary
The rapid development of wireless communication has brought great convenience to people’s lives. In order to solve these problems, it is necessary to develop materials with broadband and high electromagnetic absorption characteristics [1,2,3,4,5,6]. This requires the impedance of the material to be well matched with that of the air in a wider frequency band to ensure electromagnetic waves enter the material so that less electromagnetic energy is reflected. Carbon/metal nanoparticle composites with excellent dielectric loss and good magnetic loss have become a hot spot for electromagnetic absorbing materials in recent years. The NC/Ni displays excellent absorbing properties of electromagnetic wave, meeting the practical application requirements
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