Enhanced Interfacial Polarization Loss Induced by Hollow Engineering of Hollow Alloyed CoFe-ZIF Nanocage/Carbon Nanofibers for Efficient Microwave Absorption

Abstract

Metal organic frameworks (MOFs) have been widely studied in the field of microwave absorption due to high porosity and large specific surface area. The weak dielectric loss limits enhancement of their absorption performance. In this study, hollow alloyed CoFe-ZIF/CNFs composite fibers were successfully synthesized by electrospinning and high-temperature carbonization. The carbon fiber with dielectric loss wraps hollow alloyed CoFe-ZIF nanocage with magnetic loss to form a bamboo-shaped composite fiber to achieve magnetoelectric synergy. The construction of the hollow structure of hollow alloyed CoFe-ZIF nanocage and the combination of carbon fiber not only enriches a large number of heterogeneous interfaces, but also optimizes the impedance matching, which is beneficial to the attenuation dissipation of EMW. The results show that hollow alloyed CoFe-ZIF/CNFs composite fibers exhibit excellent electromagnetic wave absorption performance. When the filling is only 10wt%, the minimum reflection loss is -59.61 dB, and the effective absorption bandwidth reaches 6.64 GHz. This study used the combination of MOFs alloy cages and carbon fibers to regulate the absorbing properties, providing new insights into the preparation and application of 1D structural composite absorber.