STRUCTURAL DETERMINATION OF TITANIUM-OXIDE NANOPARTICLES BY X-RAY ABSORPTION SPECTROSCOPY

摘要

As a potential application of titanium-oxide nanoparticles, it is extremely importantto investigate a detailed picture of the surface and interior structural properties ofnanocrystalline materials, such as rutile and anatase with diameters 7.0 and 4.5nm,respectively. X-ray absorption spectroscopy has been used to identify the local Ti envi-ronment and related electronic structure. We combine the experimental results at theTi edge in both bulk and nano-crystals to determine the lattice distortion in terms ofdifferently characteristic preedge features and the variation in the multiple-scatteringregion of X-ray absorption near-edge structure (XANES) spectra. The relationshipbetween the transition peaks and the surface-to volume ratio is also discussed.