Preparation, structural, and electrical studies of polyaniline/ZnFe₂O₄ nanocomposites

Abstract

Polyaniline/ZnFe 2 O 4 nanocomposites were synthesized by a simple and inexpensive one-step in situ polymerization method in the presence of ZnFe 2 O 4 nanoparticles. The structural, morphological, and electrical properties of the samples were characterized by wide angle X-ray diffraction (WAXD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). WAXD and SEM revealed the formation of polyaniline/ZnFe 2 O 4 nanocomposites. Infrared spectroscopy indicated that there was some interaction between the ZnFe 2 O 4 nanoparticles and polyaniline. The dc electrical conductivity measurements were carried in the temperature range of 80 to 300 K. With increase in the doping concentration of ZnFe 2 O 4 , the conductivity of the nanocomposites found to be decreasing from 5.15 to 0.92 Scm À1 and the temperature dependent resistivity follows ln q(T) $ T À1/2 behavior. The nanocomposites (80 wt % of ZnFe 2 O 4 ) show a more negative magnetoresistance compared with that of pure polyaniline (PANI). These results suggest that the interaction between the polymer matrix PANI and zinc nanoparticles take place in these nanocomposites.

Hybrid polyaniline–TiO2 nanocomposite Langmuir–Blodgett thin films: Self‐assembly and their characterization

“…With increasing TiO 2 percentage in the composite, the intensity of the broad peak of PANi is decreased. The average particle size of PANi–TiO 2 (20 wt %) nanocomposite is found to be 29 nm using Debye‐Scherrer's equation, where K is the shape factor, λ wavelength of X‐ray, β is the line broadening at half the maximum intensity (Full Width at Half Maximum) in radians, and θ is the Bragg's angle …”

Electrical and magnetic properties of polyvinyl alcohol–cobalt ferrite nanocomposite films

“…It is used in magnetic recording media, in medical applications including magnetic resonance imaging (MRI), targeted drug delivery, magnetic separation, biosensors and hyperthermia [7,8]. Polymers have many interesting properties, such as easily transforming into any shape, light weight, corrosion resistance, environment-friendly, high mechanical strength and much more [9]. The advantage of polymer-based magnetic material nanocomposites is polymer matrix trapped the magnetic nanoparticles and restrict the agglomeration of magnetic nanoparticles, which improve the chemical stability [7].…”

Conductivity Study of Polyaniline-Cobalt Ferrite (PANI-CoFe2O4) Nanocomposite

“…It can also be applied as a corrosion resistant and light-weight material [2]. The PANI composites containing nanoparticles are usually investigated due to their unique magnetic and electrical characteristics.…”

“…Spinel ferrites which have a general structure of [ [4] exhibit noteworthy magnetic, electrical, and catalytic characteristics among magnetic materials [5,6]. When their particle size is in the nanometer range, the properties of spinel ferrites are improved remarkably [2]. Cobalt ferrite (CoFe 2 O 4 ) belongs to the family of spinel-type ferrites and is one of the most technologically important ferrites for high-density magneto-optic recording applications, due to its high coercivity, moderate magnetization, very high magnetocrystalline anisotropy, chemical stability and mechanical hardness [7][8][9][10][11].…”

“…Although many articles on the nanocomposites of PANI with magnetic nanoparticles have been published recently [2,19], there are very few studies on PANICoFe 2 O 4 [21]. The dielectric properties and losses of a material are important since it is usually not possible to infer the connectivity of a composite system from transmission electron microscopy (TEM) and scanning electron microscopy (SEM) alone [22].…”