Fig. 4.

a Schematic diagram of when the EM waves were irradiated on the sample. b Possible EM waves attenuation mechanism of the sample. The conduction loss, interface polarization, dipole polarization, and multiple scattering contribute together to EM wave absorption. c Shielding efficiency of the prepared samples. d Comparisons of EMI shielding performances in this work with the reported works. e Illustration of the influence of electronic equipment on human beings. f Established models for simulations. Model 1: a mobile phone is placed next to the human brain; Model 2: based on Model 1, the PAg3 was inserted between the phone and the brain. g SAR of the brain under the irradiation of EM waves (Model 2). h Sectional view of SAR of the brain (Model 2). i Temperature change of the brain after being irradiated by EM waves (Model 2)