KANG Peiyuan ¹, XU Xueyao ¹, ZHANG Yinghan ¹, ZHENG Qi ¹, WANG Lianjun ¹, JIANG Wan ^{1, 2}
(1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; 2. Institute of Functional Materials, Donghua University, Shanghai 201620, China)

Abstract: With the popularization of high-frequency communication technology, the problem of electromagnetic radiation has received increasing attention. The construction of novel electromagnetic wave (EMW) absorption materials based on conductive metal-organic frameworks (MOFs) has become a research hotspot in recent years. In this work, MXene modified MOF/polypyrrole (PPy) was proposed, with which high-performance EMW absorption materials with broadband and strong absorption were successfully obtained through the cooperative optimization of dielectric loss of the three components. When the filling content is only 10 wt.%, the minimum reflection loss (RLmin) of the composites can reach −56.21 dB at a thin thickness of 1.98 mm, while the maximum effective absorption bandwidth (EAB) can be up to 7.12 GHz (10.88–18.00 GHz), which is superior to the conductive MOF-based microwave absorbers reported in the open literture. By analyzing the components and microstructure of the materials, it is found that the excess PPy is not only polymerized in-situ in the pores and outer surface of UiO-66, but also loaded on the MXene substrate, which effectively builds up conductive network and promotes the conductive loss. Meanwhile, the ternary heterogeneous interface composed of UiO-66, PPy and MXene greatly enhanced the interfacial polarization loss, which further promoted the attenuation of electromagnetic waves. In addition, the simple preparation process and high yield of MXene/UiO-66/PPy have strong potential for large-scale production, which is promising to be applied in the field of electromagnetic protection.
Key words: metal-organic framework; electromagnetic wave absorption; conducting polymer; MXene