Rational Design of Multilayer Ultrathin Nano-Architecture by Coupling of Soft Conducting Nanocomposite with Ferrites and Porous Structures for Screening Electromagnetic Radiation

摘要

Fabrication of multilayered thin polymer films by rational arrangement of tailor-made nanocomposites was designed to absorb electromagnetic (EM) radiation. Mn (manganese) ferrite nanoparticles were incorporated in polyvinylidene fluoride (PVDF) matrix, along with conductive MWCNTs, treated as outer layers of the multilayer assembly. The higher permittivity, permeability and attenuation constant ensure the higher absorption ability of these resulting outer layers. Selectively etching of one of the phases of the inner layers, which consist of immiscible blends of polycarbonate (PC) and PVDF with conductive MWCNTs, porous structure can be designed to maximize the penetration of incoming EM radiation from outer layers. Further scattering of the penetrated EM wave between the interfacial walls of conducting nano fillers inside the porous matrix enhance the shielding efficiency. The resulting ultrathin (0.60 mm) multilayered architecture was able to block >99.999% (ca. 50dB) of the incoming EM radiation. This newage EM radiation absorbing material, powered by multifunctionality henceforth, offers amendable, cost-effective replacement to the existing solutions.