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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 3
BKCSDE 27(3)
March 20, 2006 

Preparation and Spectroscopic Characterization of Ilmenite-Type CoTiO3 Nanoparticles
Guo-Wei Zhou, Don Keun Lee, Young Hwan Kim, Chang Woo Kim, Young Soo Kang*
Cobalt titanate CoTiO3, Nanoparticles, CTAB micelle solution
The cobalt titanate, CoTiO3 nanoparticles have been prepared by calcinations of precursor obtained from a mixture of TiO2 and Co(OH)2 in aqueous cetyltrimethylammonium bromide (CTAB) solution. The nanoparticles were investigated with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric/differential thermal analysis (TGA/DTA) to determine the crystallite size and the phase composition. The spectroscopic characterizations of these nanoparticles were also done with UV-Vis spectroscopy and FT-Raman spectroscopy. XRD patterns show that CoTiO3 phase was formed at calcinations temperature above 600 oC. UV-Vis absorption spectra indicate that the CoTiO3 nanoparticles have significant red shift to the visible region (400-700 nm) with λmax = 500 nm compared to pure TiO2 powder (λmax = 320 nm). The new absorption peaks (absorption at 696, 604, 520, 478, 456, 383, 336, 267, 238, 208 cm-1), which were not appeared in FT-Raman spectra of P-25, also confirm the formation of Ti-O-Co bonds at above 600 oC and just not the mixtures of titanium dioxide with cobalt oxides.
368 - 372
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