Electrically conductive Two-dimensional Metal-Organic frameworks for superior electromagnetic wave absorption

Although metal–organic frameworks (MOFs)-derived composite materials have made remarkable achievements in the field of electromagnetic wave absorption, the investigation of intrinsic MOF materials for this purpose remains elusive. Herein, three two-dimensional MOFs, M3(HHTP)2 (M = Cu, Zn, Ni) were prepared by hydrothermal method, and their electromagnetic wave absorption properties and absorption mechanism were systematically studied. Due to the higher electronic conductivity, hexagonal prismatic rod-shaped Cu3(HHTP)2 exhibited better electromagnetic wave absorption performance than Zn/Ni3(HHTP)2. For Cu3(HHTP)2, a minimum return loss of is −56.45 dB, and the effective absorption bandwidth above −10 dB is 5.76 GHz and can cover the entire Ku band, which are comparable to those of the carbonized MOF-derived materials. This work broadens the application of intrinsic MOFs materials for electromagnetic wave absorption through a simple and effective strategy.