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Highly flexible electromagnetic interference (EMI) shielding material withexcellent shielding performance is of great significance to practicalapplications in next-generation flexible devices. However, most EMI materialssuffer from insufficient flexibility and complicated preparation methods. Inthis study, we propose a new scheme to fabricate a magnetic Ni particle/Agmatrix composite ultrathin film on a paper surface. For a ~2 micro meter thickfilm on paper, the EMI shielding effectiveness (SE) was found to be 46.2 dB at8.1 GHz after bending 200,000 times over a radius of ~2 mm. The sheetresistance (Rsq) remained lower than 2.30 Ohm after bending 200,000 times.Contrary to the change in Rsq, the EMI SE of the film generally increased asthe weight ratio of Ag to Ni increased, in accordance with the principle thatEMI SE is positively related with an increase in electrical conductivity.Desirable EMI shielding ability, ultrahigh flexibility, and simple processingprovide this material with excellent application prospects.

Highly flexible electromagnetic interference shielding films based on ultrathin Ni/Ag composites on paper substrates