Sandwich‐Like CNTs/Carbon@Si 3 N 4 Porous Foam for Temperature‐Insensitive Electromagnetic Wave Absorption

Abstract Despite considerable efforts to tune the morphology and composition from the macroscopic level to the nanoscale level of electromagnetic wave‐absorbing materials (EWMs), achieving strong and wide‐bandwidth absorption under a temperature‐variant environment remains extremely difficult due to the temperature‐sensitive electromagnetic‐absorbing mechanisms that involve dipole polarization and conductive loss. Here, by integrating the highly conductive carbon nanotubes (CNTs) networks and the temperature‐stable silicon nitride (Si 3 N 4 ) protective layer, a CNTs/amorphous carbon@Si 3 N 4 (C‐CNT‐Si 3 N 4 ) porous foam composed of sandwich‐like Si 3 N 4 /C‐CNT/Si 3 N 4 strut, which exhibits excellent…

• NN
  National Natural Science Foundation of China

  Awards: 52302367, 52203094
• NS
  National Science and Technology Major Project

  Awards: J2019‐VI‐0015‐0130, J2019-VI-0015-0130
• FR
  Fundamental Research Funds for the Central Universities

  Award: G2023KY05101