X-ray absorption investigation of titanium oxynitride nanoparticles obtained from laser pyrolysis
作者： Pardis Simon , Katia March , Odile Stéphan , Yann Leconte , Cécile Reynaud
DOI: 10.1016/J.CHEMPHYS.2013.04.008
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摘要: Abstract This work presents a structural study by X-ray Absorption Spectroscopy (XAS) and Electron Energy-Loss (EELS) of complex titanium oxynitride nanoparticles (Ti(O,N)), synthesized laser pyrolysis from tetraisopropoxide ammonia as precursors. Previous characterizations obtained XRD XPS have shown that the present TiO type face-centered cubic (FCC) structure but with three different oxidation degree for titanium. The synthesis this kind oxide or is very unusual. Moreover, their properties are highly dependent structure. EELS spectrum-imaging data were therefore used mapping chemical species. These measurements reveal composed FCC solid solution nitrogen oxygen in local around Ti was then studied. XANES show an absorption threshold corresponding to global valence state between 3+ 4+ , pre-edge characteristic mix disordered 2 whereas EXAFS signal dominated contribution Oxidative heat-treatments been performed 250 450 °C order follow transition towards dioxide phase. occurs surface nanoparticles. XAS does not involve any other crystallographic phase than mainly its anatase form, seems occur via completely disappears at where sample reaches complete correlation established evolution optical properties.
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