Abstract
Only very few aerogels could show exceptional electromagnetic interference (EMI) shielding above 60 dB with broad bandwidth, without employing conductive metallic fillers. Herein, a meticulously designed 3-dimensional array of V2O5 nanofibers reinforced by polyaniline (PANI) in presence of hydrochloric acid is created, which is demonstrated as a green and economic strategy for developing novel ultra-lightweight electromagnetic (EM) wave absorbers. The composite aerogel showed exceptional shielding effectiveness of 68.1 dB in X-band, with a steady bandwidth. Even in the K band also, a stunning shielding performance with a maximum of 86.1 dB is displayed, which is translated to a record-breaking specific shielding efficiency of 2777.4 dB cm3/g. Our research findings demonstrate that hierarchically porous three-dimensional (3D) architecture realized through a meticulous control of acid polymerization can lead to impressively high shielding performance, even without employing costly metallic, carbonaceous or MAX phase fillers. These ultra-low dense, sturdy aerogels could be used as efficient electromagnetic interference shields in portable devices and avionic applications.
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