RGO loaded Fe3O4 strategy to construct high toughness PAM hydrogel for electromagnetic shielding

With the continuous development of electronic products, polymers with EM shielding have received widespread attention. In this study, Fe 3 O 4 @RGO was prepared by the hydrothermal synthesis method, which solved the problems of Fe 3 O 4 precipitation and RGO stacking. Using it as a precursor, Fe 3 O 4 @RGO/PAM conductive hydrogel was prepared. The research shows that the conductivity of this hydrogel reaches 16.2 S/m at a thickness of 0.3 cm, and the maximum EMI SE is 27.1 dB. Among them, RGO can form a conductive framework, and Fe 3 O 4 can optimize the impedance matching and provide additional magnetic loss. The combined effect of the two makes the hydrogel have excellent EMI SE. In addition, PAM-based hydrogels have good thermal stability, crystallinity, water content, and mechanical properties.