Influence of Cr on structural and optical properties of TiO2:Cr nanopowders prepared by flame spray synthesis

Trenczek-Zając, Anita; Radecka, M.; Jasiński, Marcin; Michalow, Katarzyna A.; Rękas, M.; Kusior, E.; Zakrzewska, K.; Heel, André; Graule, Thomas; Kowalski, Kazimierz

doi:10.1016/j.jpowsour.2009.02.068

Cited by 50 publications

(27 citation statements)

References 34 publications

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“…To achieve this goal, it is necessary to dope pure TiO 2 with metal ions (Pt, Pd, Au, Ag, Ta, Zr, Cu, Nd, Ni, Fe, Cr, V, Mn, Co, Pb, Ce, W etc.) [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

2016

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Titanium dioxide doped nanopowders were prepared in two ways: (i) by applying a sol-gel method and (ii) by applying the sol-gel synthesis as the first step for pure TiO2 preparation, and next, doped by using magnetron sputtering technique, that is one of a physical vapour deposition method. Silver and copper (Ag, Cu) metals were used as the dopants. Prepared samples were investigated by scanning electron microscope, X-ray diffraction and UV-Vis spectroscopy. The effect of the dopants' nature and the applied doping method were studied. The results showed that each prepared particles are nanocrystalline materials with particles diameter range from 80 nm to 500 nm (depending on the doping method). From optical experiments, it was possible to observe changes in absorbance spectra, which are probably related to interfacial charge transfer and the localized surface plasmon resonance phenomenon.

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“…To achieve this goal, it is necessary to dope pure TiO 2 with metal ions (Pt, Pd, Au, Ag, Ta, Zr, Cu, Nd, Ni, Fe, Cr, V, Mn, Co, Pb, Ce, W etc.) [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

2016

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“…In order to extend its absorption spectrum towards longer wavelengths, various modifications of TiO 2 have been proposed [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] but with a limited success.…”

Section: Introductionmentioning

confidence: 99%

Study of N-doped TiO₂ thin films for photoelectrochemical hydrogen generation from water

et al. 2015

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Abstract:The present work deals with nitrogen-doped stoichiometric TiO 2 :N and non-stoichiometric TiO 2−x :N thin films deposited by means of dc-pulsed reactive sputtering for application as photoanodes for hydrogen generation from water, using solar energy. Stoichiometric thin films of TiO 2 crystallize as a mixture of anatase and rutile while rutile phase predominates in TiO 2 :N at higher nitrogen flow rates as shown by X-ray diffraction at grazing incidence, XRD GID. Lack of bulk nitridation of stoichiometric TiO 2 :N is indicated by valence-to-core X-ray emission spectroscopy, XES, analysis. The energy band gap as well as flat band potential remain almost unaffected by increasing nitrogen flow rate in this case. In contrast to that, non-stoichiometric thin films of TiO 2-x :N demonstrate systematic evolution of the structural, morphological, optical and photolectrochemical properties upon increasing level of nitrogen doping. Pronounced changes in the growth pattern of non-stoichiometric TiO 2-x :N upon varied nitrogen flow rate, demonstrated by scanning electron microscopy, SEM, can be easily correlated with the crystallographic properties studied by XRD GID. Relative positions of Kβ'' XES lines of the TiO 2-x :N thin films, which depend strongly on the nature of the ligands and their local coordination, change with the increasing nitrogen flow. Doping of nonstoichiometric titanium dioxide with nitrogen shifts the absorption spectrum towards the visible range and increases considerably the flat band potential which is beneficial for water photolysis.

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“…Among the nanomaterials, TiO 2 is one of the most interesting. TiO 2 has been used in many areas such as photocatalysis, photocells, hydrogen storage, and chemical gas sensors, biological liquids [1][2][3][4][5][6]. The pure TiO 2 is especially active in the ultraviolet light range because of its large band gap energy.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, various works have been carried out to extend the response of photoactivity of TiO 2 to visible region. It was found that by doping with transition metal ions, the c 2014 Vietnam Academy of Science and Technology activity of TiO 2 is extended to the visible light region, resulting in enhance of the photoactivity efficiency [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr\(^{3+}\) Concentration and Heat-treating Temperature on Structural Property of Cr\(^{3+}\)- doped TiO\(_2\) Nanowires Synthesized by Hydrothermal Method

Loan¹,

Long²

2015

Comm. in Phys.

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Abstract. Anatase Ti 1−x Cr x O 2 nanowires with Cr 3+ dopant contents ranging from x = 0 to 0.1 have been successfully synthesized by hydrothermal method. The nanowires were prepared from anatase titanium dioxide (TiO 2 ) powders, chromium nitrate (Cr(NO 3 ) 3 ), and sodium hydroxide (NaOH). The effect of the Cr 3+ concentration and heat-treating temperature on crystal structure, morphology and Raman spectra of the synthesized Ti 1−x Cr x O 2 samples has been studied in detail by X-ray diffraction, scanning electron microscopy and Raman spectroscopy. The results showed that the samples heat-treated at low temperature (≤600 • C) exhibited anatase phase and for Cr 3+ -doped anatase TiO 2 samples with x ≥ 0.01, Raman spectra showed a new series of peaks at 120, 236, 250, 292, 362, 430, 467 and 550 cm −1 , which were assigned to the localized vibrational modes related to the complexes containing Cr 3+ ions. The samples heat-treated at high temperature (1100 • C) exhibited rutile phase. It was observed that the characteristic Raman modes (E g and M) for rutile TiO 2 were shifted and broadened with increasing Cr 3+ dopant content. This phenomenon proves that the Cr 3+ ions have replaced the Ti 4+ ions in the rutile TiO 2 host lattice. It was found that the lattice constants of both the rutile and anatase TiO 2 were not changed when Cr 3+ dopant contents were varied.

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Influence of Cr on structural and optical properties of TiO2:Cr nanopowders prepared by flame spray synthesis

Cited by 50 publications

References 34 publications

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Study of N-doped TiO₂ thin films for photoelectrochemical hydrogen generation from water

Effect of Cr\(^{3+}\) Concentration and Heat-treating Temperature on Structural Property of Cr\(^{3+}\)- doped TiO\(_2\) Nanowires Synthesized by Hydrothermal Method

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Influence of Cr on structural and optical properties of TiO2:Cr nanopowders prepared by flame spray synthesis

Cited by 50 publications

References 34 publications

Optical Properties of TiO2Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO2Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Study of N-doped TiO2 thin films for photoelectrochemical hydrogen generation from water

Effect of Cr\(^{3+}\) Concentration and Heat-treating Temperature on Structural Property of Cr\(^{3+}\)- doped TiO\(_2\) Nanowires Synthesized by Hydrothermal Method

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Product

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Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Study of N-doped TiO₂ thin films for photoelectrochemical hydrogen generation from water