TXM-NEXAFS of TiO[sub 2]-Based Nanostructures

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In this work, electronic properties of individual TiO x -pristine nanoribbons (NR) prepared by hydrothermal treatment of anatase TiO 2 micro-particles were studied using the HZB transmission x-ray microscope (TXM) at the BESSY II undulator beamline U41-FSGM.NEXAFS is ideally suited to study TiO 2 -based materials because both the O K-edge and Ti L-edge features are very sensitive to the local bonding environment, providing diagnostic information about the crystal structures and oxidation states of various forms of titanium oxides and sub-oxides.TXM-NEXAFS combines full-field x-ray microscopy with spectroscopy, allowing the study of the electronic structure of individual nanostructures with spatial resolution better than 25 nm and a spectral resolution of up to E/∆E = 10000.The typical image field in TXM-NEXAFS measurements is about 10 µm  10 µm, which is large compared to the individual nanoparticle.Therefore, one image stack already contains statistically significant data.In addition, the directional electric field vector (Ē) of the x-rays can be used as a "search tool" for the direction of chemical bonds of the atom selected by its absorption edge.

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