Abstract
Nickel oxide (NiO) nanoparticles were prepared by the simple approach of co-precipitation method using nickel carbonate as precursor. Novel electrically conducting composite materials consisting of nickel oxide nanoparticles dispersed in a polyaniline (PANI) are prepared by an in-situ polymerization method in the presence of different weight percentage of NiO (5, 10, 15 and 20%) at room temperature using ammonium persulphate (NH4)2S2O8 as an oxidant in acidic medium. The synthesized PANI/NiO nanocomposites have been characterized by means of XRD, FTIR, UV-VIS, TEM and VSM for structural and magnetic investigation. NiO has single phase cubic structure with average crystallite size of 23nm and is intercalated to form a core shell of PANI due to which nanocomposites show the peaks of NiO as well as PANI. PANI/NiO nanocomposites showed semiconducting as well as ferromagnetic nature. It was also observed that the conductivity of the PANI/NiO nanocomposites decreased and the magnetization increased with the increase in weight percentage of NiO in PANI. We studied first time the effect of NiO on transport properties of PANI/NiO nanocomposites in terms of transport parameters such as electrical conductivity (s), charge localization length (a-1), most probable hopping distance (R) and charge hopping energy (w) using variable range hoping (VRH) of charge model as described by Ziller to conducting polymers.Copyright © 2013 VBRI press.
Highlights
Organic-inorganic composites have attracted considerable attention as they can combine the advantages of both components and may offer special properties through reinforcing or modifying each other
To the best of our knowledge, first time we have reported in this paper about the transport properties in terms of transport parameters of chemically synthesized PANI/Nickel oxide (NiO) nanocomposites by applying a variable range hopping model so as to find efficient, functionalized and electronic nanocomposites for multifunctional applications
The characteristic peak at 713 cm-1 in the spectra of NiO ascribed to the bending vibrations of the NiO crystal lattice was observed in PANI/NiO nanocomposites
Summary
Organic-inorganic composites have attracted considerable attention as they can combine the advantages of both components and may offer special properties through reinforcing or modifying each other. His main research activities include the synthesis of advanced materials at nanoscale and use them to improve the properties of conducting polymer nanocomposites. Her research interest includes the preparation of nanocrystalline metal oxides and conducting polymer nanocomposites and to study the magnetic The as-synthesized NiO nanoparticles were incarporated in PANI matrix by an in-situ chemical oxidative polymerization [29].
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