Tuning of negative permittivity and x band microwave absorption in pva nanostructured carbon metacomposites

Abstract

The rapid advancement of technology has given rise to an ever-increasing demand for materialswith unique properties that can meet the challenges of modern applications. Among thesematerials, metamaterials and metacomposites have emerged as revolutionary innovations withthe potential to transform various fields, including telecommunications, aerospace, anddefence. Metacomposites, on the other hand, combine the properties of metamaterials withthose of conventional composite materials. This fusion allows for the creation ofmultifunctional materials that offer superior mechanical strength, thermal stability, andelectromagnetic performance. Such composites are particularly valuable in applications suchas in aerospace engineering, where lightweight, strong, and EMI-resistant materials are crucial.In the present study, polymer metacomposites are fabricated with polyvinyl alcohol as thematrix and three different carbon nanostructures such as carbon black, MWCNT and graphiteis used as the conducting fillers. All fabricated sample shows negative permittivity and goodshielding efficiency in the X- band region. After that a ceramic metacomposites are alsofabricated with BaTiO3 is the dielectric matrix and TiN is the conducting filler and the negativepermittivity is obtained. Then to impart flexibility this ceramic metacomposite is added in thepolymer matrix and in order to get negative permittivity different carbon nanostructures addedand this four-component system have high shielding efficiency and suitable for electromagneticinterference shielding applications.