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S. Senthilkumaar, K. Rajendra, S. Banerjee, T. K. Chini and V. Sengodan, “Influence of Mn Doping on the Microstructure and Optical Property of ZnO,” Material Scince Semiconductor Processing, Vol. 11, No. 1, 2008, pp. 6-12. doi:10.1016/j.mssp.2008.04.005

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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.