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• W1994383025 abstract "Abstract This work presents a structural study by X-ray Absorption Spectroscopy (XAS) and Electron Energy-Loss Spectroscopy (EELS) of complex titanium oxynitride nanoparticles (Ti(O,N)), synthesized by laser pyrolysis from titanium tetraisopropoxide and ammonia as precursors. Previous structural characterizations obtained by XRD and XPS have shown that the nanoparticles present a TiO type face-centered cubic (FCC) structure but with three different oxidation degree for titanium. The synthesis of this kind of titanium oxide or oxynitride nanoparticles is very unusual. Moreover, their properties are highly dependent of their structure. EELS spectrum-imaging data were therefore used for mapping the different chemical species. These measurements reveal that the nanoparticles are composed of a FCC solid solution of nitrogen and oxygen in titanium. The local structure around Ti was then studied. XANES measurements show an absorption threshold corresponding to a global valence state between Ti 3+ and Ti 4+ , with a pre-edge structure characteristic of a mix between a face-centered cubic (FCC) structure and a disordered TiO 2 structure whereas the EXAFS signal is dominated by the contribution of the FCC structure. Oxidative heat-treatments have been performed from 250 to 450 °C in order to follow the transition towards the dioxide phase. EELS measurements show that the oxidation occurs from the surface of the nanoparticles. XAS show that this transition does not involve any other crystallographic phase than TiO 2 , mainly in its anatase form, and seems to occur via a dioxide disordered phase. The FCC contribution completely disappears at 450 °C where the sample reaches a complete TiO 2 structure. Moreover, a correlation is established between the structural evolution and optical properties." @default.
• W1994383025 created "2016-06-24" @default.
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• W1994383025 date "2013-06-01" @default.
• W1994383025 modified "2023-10-14" @default.
• W1994383025 title "X-ray absorption investigation of titanium oxynitride nanoparticles obtained from laser pyrolysis" @default.
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• W1994383025 doi "https://doi.org/10.1016/j.chemphys.2013.04.008" @default.
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