Few-layered Ti3C2Tx MXene was prepared by ionic intercalation and sonication-assisted method. Porous threedimensional

(3D) Ti3C2Tx MXene/C hybrid foam (MCF) was fabricated by sol-gel followed by thermal reduction.

The MCF/epoxy EMI shielding nanocomposites were obtained via vacuum-assisted impregnation followed by

curing process. When the mass fraction of MCF was 4.25 wt% (MCF-5), the MCF-5/epoxy EMI shielding nanocomposites

exhibited the optimal electrical conductivity of 184 S/m and the maximum EMI SE of 46 dB,

3.1×104 and 4.8 times higher than that of MCF-0/epoxy nanocomposites (without Ti3C2Tx MXene), respectively.

Furthermore, the corresponding Young's modulus of 3.96 GPa and hardness of 0.31 GPa was increased by

13% and 11%, respectively. Conductive networks can realize the attenuation and dissipation of electromagnetic

waves by multiple reflection & reabsorption, and absorption is main shielding mechanism. Unique 3D conductive

networks of MCF would expand wider application of the Ti3C2Tx MXene/polymer-based nanocomposites

in high-tech EMI shielding fields.