IR laser induced decomposition of tetrakis(dimethylamido)titanium for chemical vapor deposition of TiNx

Abstract.Nitrogen doped TiO 2 materials were successfully prepared following three different preparation routes (sol-gel, hydrothermal and pyrolysis) and characterized by various spectroscopic techniques.All samples absorbed radiation in the visible range and were active in the photocatalytic degradation of cyanotoxin microcystin-LR under visible light and in acidic conditions. The different preparation routes led to the formation of various impurities into the solids. In the case of hydrothermal and sol-gel samples, these impurities were weakly bound at the surface whereas the materials prepared by pyrolysis, the impurities showed a relevant stability and could not be removed even at high temperature. On the basis of the photocatalytic data illustrated in this paper, the presence of such species was not detrimental for the photocatalytic activity of nitrogen doped TiO 2 but actually contributed to a higher interaction with the target cyanotoxin; leading to a higher photocatalytic activity than that observed for samples prepared via the classic sol-gel method.

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“…2220 cm -1 observed in the present work is assigned to isocyanate group [30][31][32]. The assignment of the peak at c.a.…”

Section: Ir Spectra Of Materials Outgassed At Room Temperaturementioning

confidence: 51%

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

et al. 2013

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“…For example Arana at al . reported frequency values for iron cyanides adsorbed on TiO 2 at 2145 and 2137 cm −1 , while Janovska et al observed bands at 2140 and 2200 cm −1 in TiN which were ascribed to CN − species, respectively, bound to Ti ions and to organic chains. As to N/TiO 2 systems, the formation of CN − species has been previously reported by Belver et al The presence of cyanide groups was found only in sol−gel materials treated at high heating rate (leading thus to rutile formation) suggesting that, in such conditions, an interaction occurs between nitrogen and the organic components which can lead to the formation of C≡N bonds.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped Titanium Dioxide Active in Photocatalytic Reactions with Visible Light: A Multi-Technique Characterization of Differently Prepared Materials

Livraghi¹,

Chierotti²,

Giamello³

et al. 2008

J. Phys. Chem. C

162

134

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Nitrogen-doped TiO 2 materials were successfully prepared following three different preparation routes (sol-gel, mechanochemistry, and oxidation of TiN) and characterized by X-ray diffraction, electron microscopy, and various spectroscopic techniques. All samples absorb visible light, and the one obtained via sol-gel, showing the anatase structure, is the most active in the decomposition of organic compounds under visible light. Various nitrogen-containing species have been observed in the materials, whose presence and abundances depends on the preparative route. Ammonium NH 4 + ions are residual of the synthesis using ammonium salts (sol-gel, mechanochemistry) and are quite easily eliminated, as shown by the parallel behavior of both NMR and XPS spectra. Cyanide CNions form at high temperature in parallel with the phase transition of the solid to rutile. Molecular nitric oxide forms in the case of materials exhibiting close porosity. The already reported bulk radical species, N b • , is the only paramagnetic center observed in all types of samples, and is responsible for the visible light sensitization of TiO 2 . A mechanism for the formation of such a species in chemically prepared N-doped TiO 2 materials is for the first time proposed based on the reduction of Nitric Oxide (NO) at oxygen vacancies

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“…The ex situ N 1s X-ray photoelectron spectra of both films, Figure B, was fitted using four components, A through D, located respectively at 396.4, 397.4, 399.0, and 400.5 eV. Previous in situ studies have related the components around 396.0 (component A) and 399.0 eV (component C) to nitrogen bound to Ti ,− and to nitrogen embedded in an organic matrix, , respectively. It is possible that the components observed at 397.4 (component B) and 400.5 eV (component D), neither of which were reported in the in situ experiments mentioned, were due to the oxidation of nitride and organic components, respectively, upon exposure of the films to ambient conditions.…”

Section: Resultsmentioning

confidence: 99%

Reversible Tuning of the Surface Chemical Reactivity of Titanium Nitride and Nitride−Carbide Diffusion Barrier Thin Films

Rodríguez‐Reyes

Bui

et al. 2009

Chem. Mater.

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Titanium nitride-carbide (TiNC, as deposited) XPS spectraAlthough exposure to ambient conditions introduces substantial amount of oxygen and organic carbon in the film (therefore making the analysis difficult), valuable information can be extracted from the N 1s spectra, shown in Fig. 1 in the manuscript. Previous experiments in situ have assigned sets of components for N, C and Ti in nitride-based films, as shown in this table : Assignments of XPS components for in situ analysis of TiC X N Y films Components Janovska

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IR laser induced decomposition of tetrakis(dimethylamido)titanium for chemical vapor deposition of TiNx

Cited by 8 publications

References 9 publications

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Nitrogen-Doped Titanium Dioxide Active in Photocatalytic Reactions with Visible Light: A Multi-Technique Characterization of Differently Prepared Materials

Reversible Tuning of the Surface Chemical Reactivity of Titanium Nitride and Nitride−Carbide Diffusion Barrier Thin Films

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