Investigation of the structural, magnetic, and electrical properties of epsilon-negative Bamboo/NiS2/(MnFe2O4)x/PVC metacomposites

Abstract

Considerable attention has been focused on the unique and unexpected properties of lightweight, broad-spectrum, and high reflection loss (RL) metacomposites with adjustable electromagnetic characteristics. This research project aimed to investigate the structural, magnetic, and electrical attributes of Bamboo/NiS₂/(MnFe₂O₄)_x/PVC metacomposites, which display negative permittivity behavior as a novel material. When the mole value of MnFe₂O₄ was 0.0027 or lower, the presence of negative permittivity was detected at frequencies between 0–100 MHz and higher. The main reason for this was the easy creation of electrical percolation through the processed bamboo structure, which is crucial for achieving negative permittivity and high AC conductivity. The frequency-dependent variations in permittivity were in agreement with the Lorentz model. By altering the mole fraction of MnFe₂O₄ to adjust impedance, the electromagnetic absorption capabilities of the metacomposites were improved to − 25.87878 dB for a thickness of 1 mm. The findings presented in this study have the potential to pave the way for innovative developments in the field of negative permittivity metacomposites, facilitating the practical implementation of epsilon-negative materials and lightweight absorption properties in electromagnetic devices such as memristors, light-dependent resistors (LDRs), and low-frequency reflectors.