Tunable Negative Permittivity Derived From Flexible MWCNT/PVA/Mn Ferrite/AC Metacomposites

With the development of new metamaterials made of periodic array structures, negative permittivity has recently received more and more attention. However, it is crucial to achieve negative permittivity behavior based on materials' intrinsic properties rather than their synthetically periodic structures, as easy preparation is always a priority. Wearable cloaks, stretchable sensors, thin-film capacitors, and other applications all hold great promise for the flexible metacomposites with tunable negative permittivity. Herein, flexible multi walled carbon nanotube/polyvinyl alcohol/manganese ferrite/active carbon (MWCNT/PVA/Mn ferrite/AC) porous metacomposites with negative dielectric constant was prepared by feasible sol-gel method. The resulting metacomposites with various MWCNT mass values were examined for their ac conductivity behavior, magnetic and dielectric characteristics, impedance, and absorbance performances. In this work, novel amorphous metacomposites for creating outstanding properties and regulable negative permittivity is demonstrated.