International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.2, Oct. 2015, Pub. Date: Aug. 27, 2015
Studies on Structural, Morphological and Optical Properties of Cobalt Doped ZnO Nanorods
Pages: 163-173 Views: 3963 Downloads: 1868
Authors
[01] Anju Singh, Department of Physics, Rungta College of Engineering and Technology (RCET), Bhilai, Chhattisgarh, India.
[02] H. L. Vishwakarma, Department of Physics, (VEC), Lakhanpur, Sarguja University, Ambikapur, Chhattisgarh, India.
Abstract
In this paper, undoped and cobalt doped Zinc Oxide (ZnO) nanorods were achieved by a simple chemical precipitation method at room temperature in the presence of Poly Vinyl Pyrrolidone (PVP) as a capping agent. Zinc acetate (Zn (CH3COO) 2.2H2O) and cobalt acetate (Co (CH3COO) 2.4H2O) were taken as precursors. The effect of doping concentration ranging from 0 to 2 wt% on structural, morphological and optical properties have been studied by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet visible (UV-Vis) spectrophotometer. Crystallite sizes have been calculated by Debye Scherrer formula whose values are decreasing with increase in cobalt content up to 2%. The average particle size of doped nanorods is about 60 nm which is greater than that of pure ZnO (about 43 nm). It has been seen that the growth orientation of the prepared ZnO nanorods were (101). The XRD analysis also ensures that ZnO has a hexagonal (wurtzite) crystal structure. The Scanning Electron Microscope (SEM) image confirmed the size and shape of these nanorods. The absorption peaks for undoped and 1 to 2% cobalt doped ZnO nanorods samples have been observed around 355 nm, 330 nm and 380 nm by UV-Vis spectrophotometer. The doped ZnO nanorods exhibited a blue shifted band gap. The energy band gap have been obtained from the Taucs plot was found increasing up to 1% and then decreasing up to 2% of cobalt doping.
Keywords
ZnO Nanorods, Optical Band Gap, Wurtzite, XRD, SEM, Absorption Peak
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