Synthesis and electromagnetic wave absorption performance of h-BN composites

With the rapid development of microwave communication technology, electromagnetic pollution is becoming more and more serious, so wave-absorbing materials have attracted extensive attention. Carbonaceous composites have good development prospects in the field of wave-absorbing materials. Hexagonal boron nitride (h-BN) and carbonaceous materials have similar structural and lattice parameters, and the combination of the two can not only obtain composites with good absorption characteristics but also retain the excellent characteristics of both. The electromagnetic wave absorption ability of carbon-doped h-BN and carbon nanotube (CNTs)/h-BN composites in the frequency range of 2–18 GHz was investigated. The results show that the CNTs/h-BN composites prepared by the solvothermal method with sodium dodecyl sulfate as the dispersant have a minimum reflection loss of − 40.13 dB (4.5 mm, 5.28 GHz) and a maximum absorption bandwidth of 3.8 GHz (13.2–17 GHz), which have good electromagnetic wave absorption capability. Therefore, the composite material formed by h-BN and carbonaceous material has a broad absorption bandwidth and a simple preparation process, which has a broad application prospect in the field of electronic devices.