Synergistic phases in isopropanol electrospun for Fe2O3/Fe3O4@C@MoS2 nanofibers for enhanced electromagnetic interference shielding characteristics and impedance analysis

Abstract

Co-existence of phases in Fe2O3/Fe3O4@C@MoS2 nanofibers composite is synthesized via electrospinning and hydrothermal processes, where iso-propanol is utilized as a solvent. An extensive analysis is performed to evaluate the different properties, such as dielectric, morphological, structural, impedance, and electromagnetic shielding efficiency. A crystallite size of 24 nm is calculated using the Debye-Scherer formula. By using impedance spectroscopy, the electrical behavior of Fe2O3/Fe3O4@C@MoS2 nanofibers is described. Variations in frequency and temperature-dependent relaxation times are compared in an impedance plane plot. Changes in the conduction mechanism at different temperatures are observed. In Fe2O3/Fe3O4@C@MoS2 nanofibers composites, a number of distinctive characteristics in this work are explained, including stable dielectric constant, low tangent loss small polaronic hopping (SPH), and variable range hoping (VRH) model. The localization length of Fe2O3/Fe3O4@C@MoS2 nanofibers is calculated, 1/α = 1.2 Å. The typical EMI shielding efficiency of about 23 dB is demonstrated by the Fe2O3/Fe3O4@C@MoS2 nanofibers composite in the X-band frequency range. This extraordinary shielding capacity is observed in 3 mm thick nanofibers.