Synthesis, characterization and Hall-effect studies of highly conductive polyaniline/graphene nanocomposites

Abstract

The objective of this research is to prepare a series of conducting polyaniline/graphene composites by in situ chemical oxidative method through polymerization of aniline in the existence of graphene of various weight percentages. The prepared composites were examined through Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy respectively. The conductivity and dielectric attributes exhibited composition dependent percolation behavior with enhanced properties for 15 wt% of graphene in polyaniline matrix. The Hall-effect studies were performed in the prepared composites and the investigations confirm that the composites behave as n-type semiconductors. From the data obtained one can envisage remarkable improvement in the charge transport and dielectric properties of the composite at the percolation threshold due to the presence of nano-size additive in the composite. The temperature dependent conductivity in doped composites was increased by five fold in compare to pure PANI. The doping of graphene in PANI matrix, the improved dielectric parameters were achieved. The Hall effect studies were carried out in the prepared composites, the results shows that composites behaves like a n-type semiconductor. Further, the mechanical properties such as tensile stress and tensile strain were carried out in the prepared composites.

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO2/Fe3O4/n-Si Structure

“…Increasing percentages of charge carriers are accumulating at the interface of grain boundaries, which is a feature of the polarization mechanism, ECS Journal of Solid State Science and Technology, 2022 11 115004 and this causes higher values of permittivity at the low frequency side. 28 The Fig. 10c show the variation of the ε′ with the applied voltage.…”

“…According to the plot, it can be seen that the values of ac conductivity rise with applied frequency, indicating that disordered systems have a particular nature where the mechanism of hopping replaces the tunnelling of charge carriers. 28,33 The ac conductivity increases with increasing the temperature up to 303 k it decreases then it rises again. Behavior of ϭ ac can be called interfacial dipoles.…”

<i>In situ</i> Polymerization of Polyaniline/Samarium Oxide - Anatase Titanium Dioxide (PANI/Sm₂O₃-TiO₂) Nanocomposite: Structure, Thermal and Dielectric Constant Supercapacitor Application Study

“…where 0.9 is the shape factor, λ is the wavelength of the X-ray source, and β is the full width at half maximum of the peak concerned. The results summarized in Table 1 and it demonstrate that the intensity of diffraction peak (322) for PANI increased, crystallite size increase, FWHM decreased and shifted to high position after doping via oxides nanoparticles, which indicate that the crystalline of PANI increasing by doping oxides nanoparticles and in addition to the formation of ordered structure of C6H6 in nanocomposite is enhancing after addition oxide and binary oxide nanoparticle and this helping the planes scattering between C6H6 rings 24) .…”

Polyaniline based polymers in tissue engineering applications: a review

“…The conduction of charges (or electrical conductivity) in a system is always proportional to the product of the density of charge carriers (n), the charge carried by each carrier (e) and the mobility of each carrier [60].…”