Iron Oxide Fe3O4 Nanoparticles for Electromagnetic Shielding

Abstract

Magnetic iron oxide nanoparticles (Fe3O4) can be dispersed in a supporting material so that the composite can better respond to electromagnetic fields, absorbing a part of their energy. In the discussion here proposed, therefore, we will consider the role of these nanoparticles in the applications for electromagnetic interference (EMI) shielding. Inserted in intrinsically conducting polymers (ICPs) for instance, the nanoparticles are increasing EMI shielding effectiveness of polymer, producing light weight "absorption-type" shields, which are specifically relevant for absorbing microwaves. Composite materials, based on Fe3O4 nanoparticles with polypyrrole or polyaniline, will be considered in detail. Other materials, such as the recent biochar-based composites, will be discussed too.

Routes to magnetic graphene: from the decoration with nanoparticles to the symmetric broken bonds of its honeycomb lattice

“…Is an alternative existing? For the microwave absorption the answer is positive as discussed recently (Sparavigna, 2023), and it is provided by biochar 2 . But several other applications are possible.…”

“…We have encountered it in a study about the magnetic iron oxide nanoparticles (Fe3O4) dispersed in supporting materials to produce composites that can better respond to electromagnetic wave fields, absorbing a part of their energy (Sparavigna, 2023). Using the magnetic nanoparticles and suitable dielectric properties of supporting materials, we have light weight "absorption-type" electromagnetic shields, relevant for absorbing microwaves.…”

Iron Oxide Fe3O4 Nanoparticles with Intrinsic Conducting Polymers and Biochar to Improve the Electromagnetic Shielding Performance of Light Weight Absorption-Type Materials

“…An interesting approach is that proposed by Chen et al, 2023. The researchers are disclosing a facile fabrication of biochar absorbers for enhanced microwave absorption, based on Fe3O4 nanoparticles.…”