Novel Scale‐Like Structures of Graphite/TiC/Ti₃C₂ Hybrids for Electromagnetic Absorption

Abstract

Abstract Electromagnetic (EM) absorbing and shielding materials have attracted great interests due to the increasing electromagnetic pollutions in the past years. Microstructure plays a crucial role in determining the performance of the above materials. Herein, a scale‐like structure based on Ti 3 C 2 Mxenes is proposed to approach improved EM absorption properties. For the first time, graphite/TiC/Ti 3 AlC 2 (G/TiC/Ti 3 AlC 2 ) hybrids are fabricated in a molten salts bath and graphite/TiC/Ti 3 C 2 (G/TiC/Ti 3 C 2 ) hybrids are obtained after Al atoms are etched from G/TiC/Ti 3 AlC 2 . In G/TiC/Ti 3 C 2 , Ti 3 C 2 sheets are perpendicular to the plane of G/TiC, which like a bionic structure of fish scale. The scale‐like G/TiC/Ti 3 C 2 hybrids are dispersed in paraffin matrix to evaluate the EM properties. Owing to the structure‐induced EM absorption mechanism, G/TiC/Ti 3 C 2 show much enhanced EM absorption ability than those materials without structure design, e.g., G/TiC/Ti 3 AlC 2 , pure Ti 3 C 2 , G/TiC, and the simple mixture of G/TiC with Ti 3 C 2 (G/TiC+Ti 3 C 2 ). The minimum reflection coefficient (RC) of G/TiC/Ti 3 C 2 with the sample thickness of 2.1 mm reaches −63 dB and the effective absorption bandwidth (the frequency where RC is lower than −10 dB) is more than 3.5 GHz. The results indicate that the scale‐like structure can greatly improve the EM absorption ability.