The synthesis and efficient electromagnetic wave absorption properties of RE-MOF microcrystals

Electromagnetic interference is considered as a potential crisis for human health and social development. Therefore, the exploration of novel electromagnetic wave absorption (EMWA) materials with the characteristics of "Thinner", "Wider", "Lighter", "Stronger" is desired. Compared with traditional materials, metal organic frameworks (MOFs) as the emerging hybrid materials, can better meet these requirements. Here, two rare-earth metal based MOFs microcrystals with regular octahedral morphology (size about 15-20 mu m), namely MOF 1 and MOF 2 were successfully fabricated. The derived carbon materials, which remained stable octahedral morphology were obtained by carbonization of as-synthetized MOFs at 450 degrees C under the N2 atmosphere, named complex 1 and complex 2. Further investigation manifested that carbonization could effectively enhance the EMWA performance of these MOFs. Complex 1 attained the minimum RL value of - 23.22 dB and a broad effective adsorption bands(EAB) of 5.76 GHz. Similarly, the minimum RL value for complex 2 attained - 22.31 dB under the thickness of 2.5 mm with the broad EAB of 4.16 GHz.