Preparation of polyaniline/nickel oxide nanocomposites by liquid/liquid interfacial polymerization and evaluation of their electrical, electrochemical and magnetic properties

Abstract

A novel route has been developed to synthesize polyaniline (PANI)/nickel oxide (NiO) nanocomposites via liquid/liquid interfacial polymerization where NiO and the initiator were dispersed in the aqueous phase and the monomer was dissolved in the organic phase. The synthesized samples were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, ultraviolet−visible absorption, X-ray diffraction, and electrochemical, electrical conductivity and magnetic property measurements. NiO was dispersed uniformly within the PANI matrix. The composites exhibited noticeable improvement in thermal stability and electrical conductivity in comparison with pure PANI. The composites showed excellent electrochemical reversibility at a scan rate of 0.1 V s −1 and good redox stability even up to 100 cycles. The room temperature magnetic hysteresis measurements show a low value of coercivity for the polymer composites in comparison with NiO. The remnant magnetization (M r ) values were found to be increased with increasing concentration of NiO in the composites.

NiCo 2 O 4 decorated PANI–CNTs composites as supercapacitive electrode materials

“…UV-visible spectroscopy was applied to ascertain the interfacial interaction of PANI in the composites and is displayed in Fig 3 . The spectrum of PANI contains two prominent peaks at 335 nm and 630 nm which are associated with π -π * transition of benzene ring and quinoid ring respectively. A small shoulder peak at 462 nm can be assigned to polaron-π * transition [38,39] . The similar two absorption peaks of PANI are also observed at 340 and 640 nm for all the composites with different nickel cobaltite loadings, which confirms the existence of doped state of PANI in the composites.…”

“…With the increasing concentration of nickel cobaltite, the two peaks become sharper in PCM1, PCM2 and PCM3. This suggests strong interactions between PANI and nickel cobaltite [39,40] . However, for PCM4 these peaks become less intense and broader which may be due to excess amount of nickel cobaltite in the composite, suggesting weak interfacial interactions which indirectly may affect the capacitive behavior of the composite [40] .…”

Synthesis of polyaniline/ZrO2 nanocomposites and their performance in AC conductivity and electrochemical supercapacitance

“…To improve the electrical and electrochemical performances, lot of efforts have been taken to synthesize PANI with different nanostructures such as nanofibres, nanoparticles, nanotubes, etc. Literature reveals that nanoparticles such as Ag [22], Ni [23], MnO 2 [24], SnO 2 [25], TiO 2 [26], etc. could act as conductive pillers between the PANI chains that would result in enhanced electrical conductivity of nanocomposites.…”

Spinel Organic-Framework Wrapped Polymer Electrodes for Super Capacitors

“…3). A small peak at 462 nm can correspond to polaron-π * transition [41,42]. MO displays absorbance peak at 260 nm is attributed to charge transfer interactions in cobalt ferrite [43].…”