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.