Abstract
The combination of two components with uniform distribution in nanoscale is expected to facilitate wider applications of the material. In this study, polyaniline (PAn) and polyaniline/montmorillonite (Mt) nanocomposite were prepared by solid reaction using persulfate of ammonium as oxidant. The phase composition and morphology of the nanocomposite were characterized by FTIR, UV-visible spectroscopy, X-ray diffractometer, thermal gravimetric analysis, and scanning electron microscopy. The electrical and dielectric properties were determined using spectroscopy impedance. The analysis of UV-visible and FTIR spectroscopy demonstrated that aniline chloride has been polymerized into PAn in its conducting emeraldine form. Thermogravimetric analysis suggested that PAn chains intercalated in the clay host are more thermally stable than those of free PAn prepared by solid-solid reaction. Electrical measurements were carried out using the complex impedance technique in the frequency range of 10−2to 104 Hz at different temperatures. The ac conductivity data of different nanocomposites were analyzed as a function of frequency and temperature. It has been found that the incorporation of inorganic clay phase into polyaniline matrix has an effect on the electrical and dielectric properties of the nanomaterial.
Highlights
Polyaniline is one of the most interesting conducting polymers due to its environmental stability, ease in preparation, exciting electrochemical, optical, and electrical properties, microelectronics devices, biosensors, electrochromic displays, and chemical sensors [1,2,3]
Solid state intercalation can be split into two stages: the first one consists of the diffusion of guest species from the outer surfaces of guest solids and the second is based on the penetration of the guest species into the interlayer spaces
PAn was synthesized by solid-solid reaction according to the following procedure; AnCl and APS with equimolar ratio were ground in an agate mortar until the color changed to dark green
Summary
Polyaniline is one of the most interesting conducting polymers due to its environmental stability, ease in preparation, exciting electrochemical, optical, and electrical properties, microelectronics devices, biosensors, electrochromic displays, and chemical sensors [1,2,3]. Impedance spectroscopy is an important technique in understanding the charge transport mechanism and in finding the nature of charge carriers in complex systems This technique is very useful to characterize the electrical and dielectric properties related to the microstructure; it has been extensively used in many research areas such as condensed matter physics, glass science, material science, and polymer science [14, 15]. There have been several reports on the preparation and characterization of PAn/Mt nanocomposites prepared by conventional solution method, no work was done to study electrical and dielectric properties of PAn and PAn/Mt powder prepared by solid reaction. The present study aimed to investigate the electrical and dielectric properties of PAn and PAn/Mt prepared by this technique
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