# Hierarchical Porous Structured PVDF-Based Nanofiber Membranes Containing Alloy-Based Porous Nanospheres Derived from CoCuZn-MOFs for Electromagnetic Shielding

## TL;DR

This paper introduces a new flexible and lightweight electromagnetic shielding material made from nanofiber membranes with a hierarchical porous structure.

## Contribution

The novel contribution is the fabrication of alloy-based porous nanospheres from CoCuZn-MOFs and their integration into PVDF nanofiber membranes for enhanced electromagnetic shielding.

## Key findings

- The MPPA membrane achieved an average SSE of 12,017.01 dB·cm²·g⁻¹ at 2 wt.% CCZ-C content.
- The hierarchical porous structure improved electromagnetic attenuation and impedance matching.
- The material is lightweight and flexible, suitable for modern electronic and military applications.

## Abstract

Electromagnetic shielding (EMS) materials play an important role in modern technology and industry, especially in electronic equipment, communication technology, military applications and so on. With the continuous progress of technologies and the increasing demands for functional materials, EMS materials are expanding towards flexibility and being lightweight. Recently, metal–organic frameworks (MOFs) have garnered significant attention in the EMS field due to their unique structure and adjustable properties. In this paper, alloy-based porous nanospheres (CCZ-C) were fabricated by heat-treatment using CoCuZn-MOFs as precursors, and then electrospun CCZ-C/PVDF nanofiber membranes (NFMs) were prepared in a large-quantity by blending them with PVDF. Afterwards, a hierarchical porous structured NFM (MPPA) was obtained by loading a highly conductive Ag nanolayer on the surface of CCZ-C/PVDF nanofibers using pDA as a binder. By adjusting the CCZ-C content, it was determined that the EMS performance of MPPA was highest when the CCZ-C content was 2 wt.%, with an average SSE of 12,017.01 dB·cm2·g−1. This was because the hierarchical porous structure formed by adding an appropriate amount of CCZ-C further improved the electromagnetic attenuation and impedance matching of MPPA.