Preparation and Conductive and Electromagnetic Properties of Fe₃O₄/PANI Nanocomposite via Reverse In Situ Polymerization

Abstract

In this paper, the magnetite/polyaniline (PANI) nanocomposite was prepared by the novel reverse in situ polymerization method. Fe3O4 magnetic nanoparticles were synthesized in situ in PANI chloroform solution to form a suspension containing the Fe3O4/PANI nanocomposite. It overcame the disadvantage of oxidation of the Fe3O4 by the oxidant in conventional method. The Fe3O4/PANI chloroform suspension and the Fe3O4/PANI powder were characterized by FT-IR, TEM, XRD, vibrating sample magnetometer, Gouy magnetic balance, conductivity meter, and vector network analyzer. It is demonstrated that the Fe3O4/PANI suspension has a good electrical conductivity that is up to 2.135 μS/cm at the optimal ratio of reactants. The Fe3O4 nanoparticles are well dispersed in the PANI network with a particle size of about 10 nm. Fe3O4/PANI powder has high saturation magnetization and magnetic susceptibility, as well as a broad application prospect in the field of electromagnetic devices. The Fe3O4/PANI powder exhibits an excellent microwave absorption behavior, which can be an outstanding candidate for the rapid development of broadband shielding materials.

Simultaneous Square Wave Voltammetric Detection of Endocrine-Disrupting Agents Using a Nanocomposite of Magnetic Fe3O4Nanorods and Poly(3,4-Methylenedioxy)aniline

“…32,33 the magnetic needlelike Fe 3 O 4 magnetite nanorods minimized the preferential aggregation of the Fe 3 O 4 nanorods and acted as a coating agent. 34 From the HR-TEM images, the nanorod-shaped magnetite (MNR) structures were determined to be about 5.3 ± 1.1 nm in width and 61.4 ± 3.3 nm in length. Moreover, HR-TEM images of PMDAN with different magnifications are shown in Figure 1e,f that displays the absence of MNRs in PMDAN, since NaOH solution was not added.…”

“…The high-resolution transmission electron microscopy (HR-TEM) images in Figure b–d emphasize the shape and the presence of magnetic needlelike Fe 3 O 4 nanorods that were engulfed in the polymer of 3,4-MDAN (PMDAN). Previous studies have hypothesized that PMDAN surrounding the magnetic needlelike Fe 3 O 4 magnetite nanorods minimized the preferential aggregation of the Fe 3 O 4 nanorods and acted as a coating agent …”

Synthesis of Polyaniline Coated Magnesium and Cobalt Oxide Nanoparticles through Eco-Friendly Approach and Their Application as Antifungal Agents

“…The generation of free radicals by nanoparticles causes oxidation of the lipids present in the fungal cell membrane [ 36 ]. Polyaniline is among the class of polymers that exhibit excellent conducting properties [ 37 ] and assist the transfer of electrons in polymeric nanoparticles. The surface modification of nanoparticles by polyaniline may further facilitate free radical formation and augment the process of cell death.…”

Chitosan–Fe3O4 Nanoparticles Cryogel for Glucose Biosensor Development

“…However, chitosan showed a low electrical conductivity of 1.91 × 10 −4 𝜇S/cm (Marroquin et al, 2013) , therefore, in biosensor applications using electrochemical detection, chitosan needs to be combined with conductive materials. This research used Fe 3 O 4 nanoparticles to improve chitosan conductivity, which was previously reported for electrical conductivity improvement of polyvinyl alcohol (Ramesan et al, 2018) , polyaniline (Zhang et al, 2019) , poly (vinylidence uoride) (Cheng et al, 2019) , and PVA-PEG-PVP blend (Hashim et al, 2018) . Chitosan-Fe 3 O 4 nanoparticle composite was prepared in cryogel form for better enzyme immobilization and provided large surface area of substrate-enzyme interaction (Fatoni et al, 2013) .…”