Absorption-dominant EMI shielding performance of multiple folded Bi2Se3/PVDF nanocomposite films

Absorption-dominant electromagnetic interference (EMI) shielding materials are promising in reducing electromagnetic radiation pollution, but their preparation processes are usually difficult and unsuitable for large-scale preparation. In this work, multiple folded Bi2Se3/PVDF nanocomposite films were fabricated by using a convenient tape-casting method and multiple folding, which can be easily extended in industrial applications. The EMI shielding effectiveness (SE) of the composite materials was investigated, which shows typical absorption-dominant behavior and can substantially reduce secondary reflections. Specifically, for the 35%(in volume) Bi2Se3/PVDF nanocomposite film, the SEA of single-layered film with a thickness of 60 mm reaches 20 dB while SER is lower than 5 dB. After folding the film into eight layers, the SEA increased to 50 dB while SER remains below 5 dB. This method provides an effective way to the fabrication of absorption-dominant electromagnetic absorption (EMA) and EMI shielding material. (c) 2023 The Authors. Published by Elsevier B.V. on behalf of The Chinese Ceramic Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).