Abstract
To resist the increasingly serious radiation pollution, there is a great need for the fabrication of high-performance electromagnetic interference (EMI) shielding materials. However, it is a great challenge to prepare EMI shielding materials with high efficiency, lightweight, and flexibility for practical applications. Here, we demonstrate an efficient and facile approach to prepare freestanding, lightweight, and flexible crosslinking polyacrylonitrile (CPAN) nanofiber (NF)/metal nanoparticle (MNP) hybrid membranes with a high efficiency and reasonable strength via electrospinning followed by an electroless deposition process. In contrast to a Cu- and Ni-decorated CPAN NF membrane, the resultant CPAN NF/Ag nanoparticle (NP) hybrid membrane exhibited much better electrical conductivity. Furthermore, a superior EMI shielding effectiveness of ≈90 dB is achieved for the lightweight CPAN NF/Ag NP hybrid membrane (53 µm), which is superior to pure metal and most of the synthesized EMI shielding materials. The excellent EMI shielding efficiency is attributed to the high conductivity of MNPs and favorable porous structure in the hybrid NF membrane. In addition, the resultant CPAN NF/MNP hybrid membrane shows a reasonable mechanical strength and excellent flexibility. The prepared polymer NF/MNP hybrid membrane shows promising applications in smart portable and wearable electronics.
Highlights
With the rapid progress of modern electronics and telecommunications packed with large integrated circuits, an increasingly dense and intensive electromagnetic interference (EMI) of radio frequency radiation has been become a new and serious pollutant source in addition to noise, water, and air pollution, which leads to great trouble for highly sensitive electronic equipment as well as the surrounding environment
Ag seeds were deposited on the surface of the electrospun crosslinking polyacrylonitrile (CPAN) NFs via the reduction of Ag+ adsorbed on the surface of CPAN NFs through the amine groups by the reducing agent PVP
The formation of Ag seeds has been clearly observed by the color change of the NF membranes from bright yellow to dark yellow, which has been proved by the X-ray diffraction (XRD) pattern (Supplementary Figure S1b)
Summary
With the rapid progress of modern electronics and telecommunications packed with large integrated circuits, an increasingly dense and intensive electromagnetic interference (EMI) of radio frequency radiation has been become a new and serious pollutant source in addition to noise, water, and air pollution, which leads to great trouble for highly sensitive electronic equipment as well as the surrounding environment. Great efforts have been made for the development of highperformance EMI shielding material (EMI SM) that can effectively shield high energy and broadband radiation[1,2,3,4,5]. When EM radiation interacts with electrical or magnetic dipoles of shielding material, it will be absorbed and turn into heat energy. EMI shielding material should be thick enough to dissipate more radiation Both the reflection and absorption performance of the EMI shielding materials are dependent on the high electrical conductivity. Multireflection is attributed to the EM wave reflection and scattering at various inhomogeneous interfaces inside the EMI shielding material, which has recently been found to contribute to EMI shielding effectiveness[3,8,9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
