Flexible MWCNT/PVA/Mn Ferrite/AC Metacomposites with Tunable Negative Permittivity for Low-Frequency Reflectors and Optical Sensors

Abstract

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 flexible metacomposites with tunable negative permittivity. Herein, flexible multi-walled carbon nanotube/poly(vinyl alcohol)/manganese ferrite/active carbon (MWCNT/PVA/Mn ferrite/AC) porous metacomposites with negative dielectric constant were 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. The findings indicate that these novel amorphous metacomposites possess exceptional qualities, such as superior impedance matching, magnetic characteristics, exceptional reflectivity, and proficiency as an optical sensor, alongside their negative dielectric constant.

Flexible PVA/Mn Ferrite/(MoS2)x Nanocomposites With Electromagnetic Wave Absorption Performance for Light Dependent Resistances

“…Furthermore, the composition and arrangement of elements within the structure play a crucial and influential role in determining the efficiency and effectiveness of electromagnetic wave absorption. [39,40] In this study, a highly skillful sol-gel technique was employed to produce cutting-edge nanocomposites consisting of PVA/Mn Ferrite/(MoS 2 ) x . MoS 2 , when added to PVA/Mn Ferrite, enhances the dispersal properties, resulting in a greater ability for interfacial polarization and a decrease in material density.…”

Characterization of wheat husk-derived holey carbon/(RGO) x /CoFe2O4/PVA nanocomposites: insights into structural, optical, magnetic, and dielectric properties

“…Moreover, they exhibit a non-reactive behavior when exposed to other substances, ensuring their compatibility with various environments. Lastly, their low weight further contributes to their overall practicality and efficiency [7][8][9][10].…”