Magnetic field vertically aligned Co-MOF-74 derivatives/polyacrylamide hydrogels with bifunction of excellent electromagnetic wave absorption and efficient thermal conduction performances

Developing dual-function materials with efficient electromagnetic wave absorption and good thermal conductivity to achieve excellent packaging of devices has considerable appeal in modern electronic devices. Co-MOF-74 derivatives/polyacrylamide bifunctional gels (PAM-x) were synthesized by magnetic field assisted technique and in situ radical polymerization. PAM-x showed a minimum reflection loss (RLmin) of −51.6 dB and a maximum effective absorption bandwidth (EAB) of 5.73 GHz at a low filler loading of 5 wt%. The magnetic nanoparticles in the MOF derivatives orient the fillers in the polymer matrix under the action of the magnetic field to form an ordered thermal conductivity path, which improves the thermal conductivity perpendicular to the plane direction and helps to promote rapid heat transfer. This work highlights the potential of MOF derivatives/polymers as bifunctional gels, and also provides a reference for the trade-off between electromagnetic wave absorption and thermal conductivity.