Abstract
Cerium doped ZnO nanoparticles were successfully prepared by the co-precipitation method using cerium sulphate as dopant precursor. The effect of cerium doping on the structural, morphological and optical properties of the obtained nanoparticles were investigated. X-ray diffraction and EDX analyses indicated that the cerium doped ZnO nanoparticles retained the hexagonal wurtzite structure of ZnO and the cerium ions were incorporated into the ZnO lattice. TEM images showed the average diameter of cerium doped ZnO nanoparticles (30–60 nm). The absorption spectra were determined from the reflectance spectra using the Kubelka-Munk theory and the band gap energy was found to decrease as the Ce doping level increased. Ce doped ZnO nanoparticles exhibited an intense UV emission at about 380 nm, and a blue emission at 400–500 nm due to surface defects. Room temperature ferromagnetism was found in these samples associated with Ce3+ ion doping and oxygen vacancies.
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