High-efficiency electromagnetic wave absorption of TiB2-SiCnws-SiOC synthesised using PDCs

Abstract

A designed conductive nanoheterogeneous structure can boost interfacial polarisation and effectively enhance the wave absorption properties . Herein, maze-shaped nanoheterogeneous TiB 2 -SiCnws-SiOC ceramics were synthesised via a polymer-derived ceramics (PDCs) approach for constructing a three-dimensional reticular structure. The addition of TiB 2 not only compensates for the lower conductivity, but also facilitates the growth of curved SiCnws. The results show that the addition of 20 wt% TiB 2 leads to favourable microwave absorption performance , with a minimal reflection coefficient of − 55.1 dB at 8.9 GHz and an effective absorption bandwidth of 4.2 GHz. This can be ascribed to the synergistic effect among polarisation loss, conduction loss , and microwave multiple reflection and scattering due to the unique structure. This study may contribute towards establishing multi-loss mechanisms and controllable dielectric properties in PDCs.