Abstract
An efficient electromagnetic interference (EMI) shielding paper with excellent water repellency and mechanical flexibility has been developed, by assembling silver nanowires (AgNWs) and hydrophobic inorganic ceramic on the cellulose paper, via a facile dip-coating preparation. Scanning electron microscope (SEM) observations confirmed that AgNWs were interconnected and densely coated on both sides of the cellulose fiber, which endows the as-prepared paper with high conductivity (33.69 S/cm in-plane direction) at a low AgNW area density of 0.13 mg/cm2. Owing to multiple reflections and scattering between the two outer highly conductive surfaces, the obtained composite presented a high EMI shielding effectiveness (EMI SE) of up to 46 dB against the X band, and ultrahigh specific EMI SE of 271.2 dB mm–1. Moreover, the prepared hydrophobic AgNW/cellulose (H-AgNW/cellulose) composite paper could also maintain high EMI SE and extraordinary waterproofness (water contact angle > 140°) by suffering dozens of bending tests or one thousand peeling tests. Overall, such a multifunctional paper might have practical applications in packaging conductive components and can be used as EMI shielding elements in advanced application areas, even under harsh conditions.
Highlights
With the flourishing development of mobile communications and electronic devices, which has brought significant conveniences for people, the increasing electromagnetic (EM) waves that are inevitably emitted by these electronic devices can be harmful to human beings and cause the malfunction to other electronics close to them [1,2,3,4,5,6,7,8]
The surface and cross-section Scanning electron microscope (SEM) images of the pure cellulose paper, D-1, D-5 and D-10 are shown in Figure 2, respectively
A roughened surface and internal porous structure consisting of cellulose fibers was clearly observed, both from the surface and the cross-section of the pure cellulose paper (Figure 2a,a’,e)
Summary
With the flourishing development of mobile communications and electronic devices, which has brought significant conveniences for people, the increasing electromagnetic (EM) waves that are inevitably emitted by these electronic devices can be harmful to human beings and cause the malfunction to other electronics close to them [1,2,3,4,5,6,7,8]. There is an urgent need to develop electromagnetic interference (EMI) shielding materials to reduce the EMI pollution. Metal and metallic alloy compounds are widely used as traditional EMI shielding materials due to their high conductivity. Poor flexibility, high density, processing difficulties and susceptibility to corrosion, all limit its extensive application in electromagnetic shielding. Intrinsic conducting polymers, such as polyaniline, polypyrrole, and polythiophene and their derivatives (film or fabric) are considered to be suitable. EMI shielding materials because of their good environmental stability. The difficulties in processing, the high cost and poor designability has hampered the large-scale application of these materials. Conductive polymer composites (CPC) with contained conductive nanofillers, such as carbon nanotubes (CNT), graphene, nanowires, nanorods, and transition metal carbide/carbonitride
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
