摘要
Heterointerfaces formed by the intimate connection of different materials with electromagnetic losses are expected to achieve stronger electromagnetic(EM)absorption.However,constructing composites with heterointerfaces still faces great challenges in facile preparation process,optimized impedance matching,high reflection loss(RL),and ultrathin matching thickness.In this work,we develop ZIF-8 functionalized MXene to produce hierarchical Ti_(3)C_(2)@C@ZnO composites with heterointerface to advance EM absorption enhancement.Modified with polydopamine(PDA),few-layer Ti_(3)C_(2)T_(x) MXene sheets enable adsorption of Zn^(2+)metal ions on Ti3C2Tx@PDA by electrostatic interaction for in-situ growth of ZIF-8.Ti_(3)C_(2)/C/ZnO heterointerface were obtained after heat treatment of Ti_(3)C_(2)T_(x)@PDA@ZIF-8 nanocomposites at various temperatures.The Ti_(3)C_(2)/C/ZnO-600℃ with 1.15 mm thickness have a RL of−50.241 dB and an effective absorption bandwidth of 3.50 GHz.In-depth studies on the electromagnetic loss mechanisms reveal that Ti3C2,carbon,and ZnO in nanocomposites generate multiple interfacial polarization losses beyond partial conductivity losses caused by Ti_(3)C_(2) and ZnO.Oxygen vacancy defects in ZnO form dipole losses with carbon.This work not only provides a simple and effective concept for preparing MXene@MOFs heterogeneous composites as an ultrathin and strong electromagnetic wave absorber,but also offers a vital guideline to fabricate various metal oxides derived from the MXene and metal-organic frameworks(MOFs)precursors.
基金
The authors thank the financial support from the National Natural Science Foundation of China(No.52071270)
the National Key Research and Development Program of China(No.2023YFE0206300)
the Natural Science Foundation of Shaanxi Province(No.2024RS-CXTD-62)
the Science Fund of Shandong Laboratory of Advanced Materials and Green Manufacturing(Yantai)(No.AMGM2023F03)
the Research Fund of the State Key Laboratory of Solidification Processing(NPU)(No.2022-QZ04)。
作者简介
Address correspondence:Jianxi Liu,jianxiliu@nwpu.edu.cn;Address correspondence:Xingmin Liu,liuxingmin19890101@126.com;Address correspondence:Yadong Xu,xyd220@nwpu.edu.cn。
