Bioinspired porous Ti₂CT_X/Si₃N₄ composites with aligned lamellar structure for efficient microwave absorption

Abstract

With the ever-deepening understanding of nano-electromagnetic interactions and the advancements of fabrication methodologies of nanomaterials, diverse electromagnetic platforms utilizing nanomaterials have been developed for next-generation electromagnetic safeguarding applications. This study presents the design and fabrication of bioinspired porous Ti₂CT_X/Si₃N₄ composites featuring an aligned lamellar structure, aimed at facilitating the effective absorption and dissipation of electromagnetic radiation. The layered configuration of Ti₂CT_X/Si₃N₄ composites facilitates the repeated reflection of electromagnetic waves between neighboring Ti₂CT_X layers, hence enhancing the energy dissipation of these waves. At a Ti₂CT_X concentration of merely 0.21 wt.%, the effective absorption bandwidth of Ti₂CT_X/Si₃N₄ composites encompasses the whole X-band (8.2-12.4 GHz), with a minimum reflection loss of -53 dB achievable at a sample thickness of 5 mm. Simultaneously, the fabricated Ti₂CT_X/Si₃N₄ composites demonstrate advantages in lightweight characteristics and robust mechanical properties, offering significant insights for the application of Ti₂CT_X in nano-electromagnetic engineering, particularly in the realm of electromagnetic pollution mitigation.

Keywords

Ti₂CT_X / amorphous Si₃N₄ / bio-inspired lamellar structure / ice-templated method / microwave absorption

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