Manganese ferrite—polyaniline nanocomposites for microwave absorbers in X band

From the past few decades, ferrite is well-known noble material due to its prominent properties like structural, electrical and magnetic properties. With these advantages, ferrites have been used as a substance to incorporate various kinds of functional materials. Among all the ferrites, MnFe 2 O 4 -based polyaniline nanocomposites have attracted a great deal of interest due to their enhanced performance due to low cost, strong environmental stability and intriguing electroactivity. In the present work, MnFe 2 O 4 is prepared by sole-gel auto-combustion method and MnFe 2 O 4 @PANI nanocomposites were synthesised by mechanical mixing method with various wt% (from 10 to 50%). The as-prepared nanocomposites were characterised by the XRD, and TEM and VSM are used to study the properties like structural and magnetic behaviour of the ferrite-mixed PANI composite. In the 8 GHz–12 GHz range, the complex permittivity and permeability of composite samples were calculated. The values of permittivity were observed to increase as ferrite volume concentration increased, while permittivity decreased as PANI increased. As a result, polyaniline-based nanocomposites specifically demonstrate that they can be used as EMI shielding materials. These nanocomposites are used in microwave absorbers in X band applications.