The fabrication of Ce-MOFs with the effective electromagnetic wave absorption performance

Low frequency electromagnetic waves are widely used in human daily life, especially in the areas of wireless communication and medical technology. However, the wide application of these low frequency electromagnetic waves has caused the inevitable electromagnetic pollution and interferences. Hence, the fabrication of functional absorbers to dissipate the electromagnetic wave is the effective way to solve this problem. It is worth to note that the unique magnetism and conductivity which are arising from the unique 4f electron layer of Ce atoms will undoubtedly facilitate the dielectric and magnetic losses during the electromagnetic wave attenuation process. Nonetheless, Ce based MOF materials are barely reported as the electromagnetic wave absorbers. Therefore, two Ce-MOFs, based on different valence states of Ce, have been successfully fabricated here. The Ce(IV)-MOF based electromagnetic wave absorber exhibits the better EMWA performance: the minimum RL value of Ce(IV)-MOF is –32.12 dB @4.56 GHz under the thickness of 5.5 mm, while the EAB(effective absorption band) of Ce(IV)-MOF of 2.88 GHz (3.92 to 6.8 GHz) can be achieved, indicating the effective absorption of C-band electromagnetic waves. Moreover, the influence of different valence states of Ce on the electromagnetic wave absorption (EMWA) has been initially investigated and elucidated.