Semiconductive MOF as a promising platform for green and efficient electromagnetic shielding

Abstract

Despite significant advancements in the use of composite materials derived from metal-organic frameworks (MOFs) for electromagnetic wave absorption, the inherent electromagnetic shielding properties of MOFs remain challenging to achieve. This is because the reflection loss dominated electromagnetic shielding materials typically necessitate extremely high conductivity, whereas intrinsic MOFs are generally insulators. Furthermore, excessive reflection loss arise from high conductivity will cause secondary electromagnetic pollution, severely disrupt communication equipment and endanger human health. Here, we successfully synthesized two conductive MOFs, and directly used for electromagnetic shielding. Due to the strong polarization effect, moderate conductivity, and anisotropic 1D chain structure, the effective shielding (SET) of CuMOF-1D achieves 34.08 dB, surpassing 20 dB within the 1-18 GHz range, and demonstrates a high absorption loss (SEA) of 29.75 dB with a low reflection loss (SER) of 4.33 dB. The SEA/SET value reaches 87.3%, the green shielding index is 0.83. These findings not only accentuate the importance of CuMOF-1D as a green electromagnetic shielding material that preponderantly relies on absorption loss but also emphasize the latent potential of intrinsic conductive MOFs to serve as a gene tailoring platform.