Abstract
The present work reports the synthesis of PANI composite with hexamminecobalt(III) chloride metal complex as dopant via in situ oxidative polymerization by ammonium persulphate in non-aqueous DMSO medium. The dopant metal complex has been synthesized by known method and characterized by using FTIR, XRD and SEM analysis. The synthesized PANI/[Co(NH3)6] Cl3 composite was characterized by FTIR, XRD, UV-Vis and SEM techniques. FTIR of PANI composite showed its successful synthesis with the presence of some dopant peaks in its FTIR spectrum. XRD spectra of composite revealed its crystalline nature having almost same spectra as that of dopant metal complex with slight shift in the position of peaks. Electrical measurement of the composite was made using four probe conductivity meter and the thermal studies have been done by thermal gravimetric (TG) technique. The results showed improvement in the thermal stability of PANI composite together with increase in its conductance, thereby making it a possible future material for high temperature application purposes. Electronic properties of the composite were investigated using UV-Vis spectroscopy which revealed decrease in the energy band gap of the composite on irradiation. This is attributed to the distortion of polymer chains on exposure to radiations, which results in decrease in conjugation and hence increases in band gap energy.
Highlights
Conducting polymers are organic polymers capable of conducting electricity that has been studied extensively and are called as the materials of 21st century
The Fourier transform infrared (FTIR) spectra of PANI, dopant metal complex and PANI composite are shown in the Figure 3a-c
The insertion of dopant metal complex into the PANI is evident by the presence of some dopant peaks in the FTIR spectrum of PANI composite with some shift in their position
Summary
Conducting polymers are organic polymers capable of conducting electricity that has been studied extensively and are called as the materials of 21st century. The reduction in the size of the dopant to nano level results in dramatic change in electrical, thermal, electronic, magnetic, optical, and other properties of polymers In this direction polyaniline (PANI) has been studied and investigated extensively with respect to facile synthesis by chemical and electrochemical process, environmental stability, low cost, high conductivity, solubility, and chemical sensitivity[1]. It has drawn considerable attention for its wide application in microelectronic devices, photodiodes, sensors, light weight batteries, solar cells, electrochemical capacitors, corrosion capacitors, corrosion inhibitors, drug delivery and electromagnetic interference shielding materials[2,3,4]. The composite prepared has been subjected to various spectroscopic characterizations including surface morphology and its electrical and thermal properties have been studied for its possible future applications
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