Structural and Photoluminescence Studies of Ni-doped ZnO Nanoparticles Synthesized by Solution Combustion Method
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Structural and Photoluminescence Studies of Ni-doped ZnO Nanoparticles Synthesized by Solution Combustion Method SILAMBARASAN Murugesan1*, SARAVANAN Shanmugam1, OHTANI Naoki2 and SOGA Tetsuo3 1 Centre for Photonics and Nanotechnology, Sona College of Technology, Salem – 636 005, Tamil Nadu, INDIA 2 Department of Electronics, Doshisha University, Kyoto-610 032, JAPAN 3 Department of Frontier Materials, Nagoya Institute of Technology, Nagoya-466-8555, JAPAN *E-mail: [email protected] ABSTRACT In this paper, the authors have reported the structural and photoluminescence (PL) studies of pure and nickel (Ni) doped zinc oxide (ZnO) nanoparticles synthesized by the solution combustion method. The structural, morphological and optical studies are carried out by powder x-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) and PL spectra, respectively. The XRD pattern indicates that the prepared particles are in hexagonal wurtzite structure with the average crystalline size is around 35-50nm. Room temperature PL shows the near band edge related emission and the results are related several intrinsic defects in the ZnO nanoparticles. INTRODUCTION The ZnO nanostructures are the most important II-VI compound semiconductor due to their unique optical, electrical, chemical and non-toxic properties with wide bandgap (3.37eV) and large exciton binding energy (60meV). The ZnO is a very promising material for a wide range of application in optoelectronics and solar cells, such as light emitting devices, photodiodes, photodetectors, gas sensors, piezoelectric transducers, transparent conductive film, optical modulator waveguides, photonic crystals and biological sensors [1-3]. The ZnO nanostructures can be synthesized either in solution or gaseous phase. The gas phase synthesis methods are expensive and complicated. The solution phase synthesis is usually done in aqueous solution. The solution phase synthesis of ZnO nanostructures has more popularity due to its simplicity. Doping of transition metal ions in the ZnO has lead to enhancement of the bandgap, optical, electrical and magnetic properties. Especially, the study of the effect of dopants on optical properties of ZnO based nanomaterials is very important for photonic applications. The optical properties of ZnO can be improved by incorporating various ions in the crystal lattice [46]. In this work, the structural and optical studies of pure and Ni doped ZnO nanoparticles (NP) synthesized by the solution combustion method are reported. In this method, a mixer of ethanol and ethylene glycol (EG) are used as the solvent, zinc acetate dihydrate as the zinc source, oxygen gas in the atmosphere as the oxygen source and nickel (II) acetate as the doping agent as well as nickel source. The combustion reaction was carried out in air under ambient pressure and Ni doped ZnO NP was obtained in one step. Therefore, the synthetic approaches provide a simple, cost-effective, easy and convenient route to obtain large quantities of ZnO NP.
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