MXene-derived titanate heterojunctions with lightweight and heat-resistant properties for electromagnetic wave absorption

Abstract

The development of high-efficiency titanate-based electromagnetic wave (EMW) absorbers presents a significant challenge, primarily due to the limited number of loss mechanisms available in such materials. Herein, an innovative approach has been employed, utilizing g-C₃N₄ as a connecting bridge linking KTi₈O_16.5 nanorods with Fe₂O₃ nanoparticles, thereby crafting a KTO/Fe₂O₃–CN absorber with a dual heterojunction architecture. This sophisticated structure is realized through a detailed freeze-drying process followed by heat treatment. In this structure, g-C₃N₄ and KTi₈O_16.5 originate from melamine and MXene precursors, respectively, while Fe₂O₃ component is derived from the thermal decomposition of FeSO₄. The integrated KTO/Fe₂O₃–CN system fosters enhanced interfacial and dipole polarization, as well as conduction and magnetic loss, all collaboratively aiding in the attenuation of EM waves. In addition, the specially designed EMW absorber is notable for its lightweight nature, along with impressive heat dissipation and resistant performance. It demonstrates exceptional thermal stability, capable of withstanding temperatures as high as 500 °C and sustaining repeated thermal cycles at 400 °C. This strategy not only elevates the efficacy of titanate-based EMW absorbers but also paves the way for the conceptualization of high-performance, multifunctional EMW absorption materials. Such advancements hold the promise of transforming a wide range of applications that necessitate effective EM wave attenuation, marking a significant leap forward in the field.