Structural characterization of TiO2ultrafine particles

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Abstract
Four samples of TiO2ultrafine particles (UFP) were obtained through different processes. The structure of TiO2ultrafine particles and the factors influencing the structure were investigated with Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and x-ray diffraction (XRD). Both Raman spectra and x-ray diffractograms show the similar regularity of the phase transformation among the four samples. The observed bimodal lineshape-structure in the Raman spectra is attributed to the intragrain and grain-boundary components of TiO2UFP. The crystal structure of TiO2UFP is found to be distorted by the surface structure such as OH and OCH2CH3groups coordinated on the surface of TiO2UFP.