MOF-confined FeCoNi@carbon/Al2O3/silicone rubber composites with synergistic thermal conductivity and enhanced microwave absorption

With the increase of power density in electronic devices, the electromagnetic (EM) compatibility and heat dissipation problems of electronic devices are becoming increasingly serious. Herein, MOF-derived FeCoNi@carbon (MOF-FeCoNi@C) composites were obtained by a simple one-step carbon thermal reduction of FeCoNi-MOF/polyacrylonitrile (PAN), and then combined with Al 2 O 3 to construct the thermally conductive and microwave absorbing silicone rubber sheets with dual functional characteristics (MOF-FeCoNi@C/Al 2 O 3 /SR). The MOF-confined strategy could achieve controllable growth and uniform distribution of FeCoNi alloy nanoparticles, optimize impedance matching, enhance the EM synergy and EMWs attenuation. Therefore, when the amount of MOF-FeCoNi@C added was 15 wt%, the minimum reflection loss ( RL min ) was -35.4 dB at 13.6 GHz with a thickness of 1.5 mm and an effective bandwidth (EBW) reached 4.1 GHz. Furthermore, the sample exhibits excellent thermal conductivity under the combined action of MOF-FeCoNi@C and Al 2 O 3 . As a consequence, this work utilizes a simple preparation process to develop a new type of absorber and promote its application in rubber sheets, provides a new idea for the research of microwave absorbing materials and has important practical significance.