Abstract
This work investigates radiofrequency shielding by polypyrrole (PPy)-coated fibrous mats consisting of nano and regular fibers. Radiofrequency shielding protects human beings as well as electronic devices from the harmful effects of radiofrequency waves. The results of this study show that, generally, lowering the fiber diameter of the coated mats increases the reflection but decreases the absorption of radiofrequency radiation in the range of 5 GHz to 8 GHz. Moreover, absorption of higher frequencies is greater than that of lower frequencies, whereas for reflection the opposite trend is observed. The sum of absorption and reflection of radiofrequencies in the range of 5 GHz to 8 GHz by PPy-coated mats is not affected by the fiber diameter of the mats. PPycoated regular poly(acrylonitrile) (PAN) and poly(ethylene terephthalate) (PET) fiber mats with weight per unit area of 16.67 mg/cm 2 provide radiofrequency shielding above 85%. Nanofibrous mats with weight per unit area of nearly 60 times less showed similar radiofrequency shielding effectiveness as regular fiber mats, highlighting the importance of the high specific surface area of nanofibers.
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