Abstract
Manufacturing a flexible, light, large-area, and high-efficiency electromagnetic shielding materials in a straightforward and cost-effective manner presently remains a significant challenge. In this work, we propose a conductive network design and verify its electromagnetic interference (EMI) shielding effectiveness (SE) by simulation. Using the structure and parameters obtained by simulation, we prepare a flexible EMI shielding material using silver nanowires (AgNWs)/polyvinyl butyral (PVB) ethanol solution and textile substructure via a facile immersing method. In the frequency range of 5–18 GHz, the AgNWs/PVB textile with 1.4 mm thickness achieves an EMI SE of 59 dB, which exceeds the requirements for commercial applications. Due to the low density of 56 mg/cm3, specific shielding effectiveness (SSE) of this material reaches 1053 dB m3/g. It is found that the AgNWs/PVB textile is more resistant to washing with water and oxidation than AgNWs textile without a PVB protector. As a result, the conductivity of AgNWs/PVB textile exhibits no change after washing with water and varies slightly after being kept in hot air. We find that a signal monitor is unable to detect a signal emitted by a mobile phone from a jacket lined with AgNWs/PVB textile. AgNWs/PVB textile with these properties can be mass-produced as high-efficiency EMI shielding material for commercial applications.
Highlights
With the development of wireless-telecommunication technology, the human environment is becoming increasingly congested with electromagnetic radiation, which may be a health hazard[1,2,3]
Relationship between the thickness and electromagnetic interference (EMI) shielding effectiveness (SE), we calculate this relationship for silver by using the equation from Supplementary Note
We find that S-parameter of S21 of this network structure can reach 35 dB for 0.4 mm thickness and 55 dB for 1.4 mm, showing that a conductor with low conductivity can be an excellent EMI shielding material if shaped into a network
Summary
With the development of wireless-telecommunication technology, the human environment is becoming increasingly congested with electromagnetic radiation, which may be a health hazard[1,2,3]. Certain high-end precision scientific and military equipment require environment without electromagnetic interference[7,8]. EMI shielding is most commonly based on electromagnetic wave reflection by charge carriers. High electrical conductivity is required for EMI shielding materials[9,10]. Electrical conductors such as copper, silver, and carbon-based materials are widely used for EMI shielding[11,12,13,14,15,16,17]
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