Hydrothermal Carbonization\nof V₂O₅ Nanowires into Aerogels for Excellent\nGreen Electromagnetic Interference\nShielding

Abstract

Realizing a potential lightweight electromagnetic interference\n(EMI) shield with high absorption and low secondary reflection is\nstill challenging. Herein, a novel ultralight aerogel was prepared\nby simple hydrothermal carbonization of V₂O₅ nanowires. The highly porous and three-dimensional (3D) conductive\nnanowire networks inside the aerogel simultaneously support EM wave\ndissipation through multiple internal reflections and reduce shield\ndensity to 0.026 g/cc. The designer aerogels exhibit high shielding\nefficiency (SE) in X, Ku, and K bands with a maximum EMI SE of 43.24\ndB at 26.5 GHz. Exceptional specific shielding efficiency of 5147.6\ndB cm²/g was achieved in the K band with a high green index\nof 1.58. The lightweight carbonized V₂O₅ aerogels\nare promising shielding structures suitable for aircraft and portable\ndevice applications. The hydrothermal synthesis procedure with hazard-free\nmaterials described here proves that efficient shielding aerogels\ncan be successfully constructed through facile synthesis protocols.