Structural characterization of TiO₂ultrafine particles

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 Ti_O2UFP is found to be distorted by the surface structure such as OH and OCH₂CH₃groups coordinated on the surface of TiO₂UFP.