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The pure Zinc Oxide, Cobalt doped Zinc Oxide and Manganese doped Zinc oxide nanoparticles were synthesized using Co-precipitation method. This work aims to study the effect of doping on the structural, morphological, and optical properties of the synthesized pure and doped ZnO nanoparticles. The structural and morphological change of the nanoparticles were examined by using X-ray Diffraction analysis (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The elemental analysis was studied with Energy Dispersive X-ray analysis (EDAX). The optical property of the particles were analysed using UV-Visible Spectroscopy (UV) and Photoluminescence Spectroscopy (PL). The XRD results shows all the nanoparticles are crystalline and pure in nature. The doping effect found to decrease the particle size of the ZnO nanoparticles. The SEM images also show the doping has significant change on the morphology of the ZnO nanoparticles. The functional groups present in the nanoparticles were confirmed using Fourier Transform Infrared Spectroscopy. The optical property of UV-Vis spectrum shows red shift and the band gap also found to decrease for doped nanoparticles. The presence of dopants in the nanoparticles was confirmed with the EDAX spectrum. The results of above characterization techniques confirmed the doping has significant influence on the structure, morphology, and optical property of the ZnO nanoparticles.

Undoped ZnO nano particles and Ni doped ZnO nanoparticles prepared by chemical precipitation method and assessed for their structural, morphological and optical properties. The prepared undoped and Ni doped ZnO nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transform infrared spectral (FTIR), UV-Visible spectrophotometer, Scanning electron microscopy (SEM) and Energy Dispersive X-ray analysis (EDAX), Photoluminescence spectra (PL). XRD pattern shows the purity of prepared undoped and Ni doped ZnO nanoparticles size. Scanning electron microscopy (SEM) observations revealed remarkable change in morphology of the prepared samples. The presence of functional groups and chemical bonding was confirmed by FTIR and UV analysis. The defect states were revealed from the UV and visible emissions of the photoluminescence spectra.

Polymeric blends of Poly (p-anisidine) with ZnO nanoparticles was prepared by chemical oxidative polymerization. Zinc oxide doped PPA polymer nanocomposite (ZPPA) and Magnesium doped Zinc oxide PPA polymer nanocomposite (MZPPA) were synthesized with the addition of semiconductor metal oxide to the polymeric solution. The X-ray diffraction studies of ZnO nanoparticles showed hexagonal wurzite structure. The surface morphological study also confirms the formation of hexagonal structured nanoparticles. The peak for Magnesium and Zinc in EDS spectra confirms the formation of Magnesium doped polymer nanocomposite. The addition of ZnO/MgZnO onto PPA conducting polymer showed agglomeration of semiconductor material results in spherical shaped polymer nanocomposite and irregular overlapping over the PPA polymeric surface. The electrochemical conductivity studies suggested that the doped PPA conducting polymeric blends showed enhanced conductivity nature.

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