Electrical transport properties and dielectric response in Al doped NiO Nanostructures
P Tripathi
Aligarh Muslim University, India
: J Pharm Drug Deliv Res
Abstract
In this talk we have studied the electrical and transport properties of Ni1-xAlxO (x = 0.00, 0.01, 0.03, 0.05) nanoparticles which have been synthesized through wet chemical route such as sol-gel method at 6000C. The XRD patterns reveal that the NiO nanoparticles have cubic polycrystalline crystal structure with average crystallite size ranging from 18.20 to 9.54 nm which have been calculated through Debye- Sherrer and William Hall method. The morphology and size of the nanoparticles were also observed by Scanning electron microscopy (SEM) and transmission electron microscope (TEM) for pure and 5% Al doped NiO nanoparticles. We have studied the DC resistivity and activation energy of our samples using two probe measurements. In addition, dielectric response(τ), ac conductivity (σac) loss tangent (tan δ) and impedance analysis have been carried out using LCR meter in the frequency range 75 kHz to 2 MHz with temperature range 500C– 4000C . It has been observed that pure and Al doped NiO nanoparticles exhibit giant value of dielectric premitivity (103-104). The high value of dielectric constant of Al doped NiO nanoparticles depends on Al concentration and can be ascribed to the thermally activated and Maxwell–Wagner polarization mechanism.
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