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J. J. Lu, T. C. Lin, S. Y. Tsai, T. S. Mo and K. J. Gan, “Structural, Magnetic and Transport Properties of Ni-Doped ZnO Films,” Journal of Magnetism and Magnetic Materials, Vol. 323, No. 6, 2011, pp. 829-832. doi:10.1016/j.jmmm.2010.11.025

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• TITLE: The Effect of Co Incorporation into ZnO Nanoparticles

  AUTHORS: Nadia Febiana Djaja, Dionisius Agung Montja, Rosari Saleh

  KEYWORDS: Transition-Metal-Doped ZnO Nanoparticles; Room-Temperature-Ferromagnetic; Co-Precipitation

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.3 No.1, March 27, 2013

  ABSTRACT: Co-doped ZnO nanoparticles are synthesized by co-precipitation method. The incorporation of Co ions into ZnO wur- zite structure with increasing Co concentrations was followed by X-ray diffraction. Sample structures were further studied by infrared spectra, from which a broad and strong absorption band in the range of 400 - 700 cm-1 and -OH stretching vibrational mode approximately 3400 cm-1 were observed. Ultraviolet-visible measurements showed a red shift of the absorption edge and four peaks at 468, 515, 577 and 629 nm in its reflectance spectra with increasing Co content. Magnetic measurements showed a ferromagnetic behavior for all samples. From the ESR spectra the presence of Co-metal clusters and Co-oxide precipitates are not observed and can be excluded as the origin of ferromagnetic in our samples. The ESR results are supported by UV-Vis measurements data.