Effects of nitrogen doping on optical properties of TiO2 thin films

Wu, Peihui; H., C.; Shang, Jian Ku

doi:10.1007/s00339-004-3101-4

Cited by 139 publications

(96 citation statements)

References 22 publications

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“…[8] In particular, the application of nitrogen-doped titania as photocatalyst has received increasing attention over the last years because N-doping is found to be particularly effective in decreasing the bandgap of anatase. The incorporation of nitrogen into the titania network has been achieved trough different methods, such as reactive DC magnetron sputtering, [9] ionbeam-assisted deposition, [10] position, [11] laser ablation, [12] or ball milling, [13] using a variety of nitrogen sources, such as amines, urea, N 2 , or ammonia, [14][15][16][17] and different titanium sources, such as TiCl 4 , [18] TiCl 3 , [19] Ti(OH) 4 , [20] or Ti(SO 4 ) 2 . [21] However, it should be pointed out that the visible-light photocatalytic activity of the resulting materials is highly sensitive to the synthetic route used in their preparation.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Titanium Oxynitride Porous Thin Films as Efficient Visible‐Active Photocatalysts

Martínez‐Ferrero¹,

Sakatani²,

Boissière³

et al. 2007

Adv Funct Materials

174

133

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Nanocrystalline mesoporous N‐doped titania films have been prepared for the first time. The introduction of nitrogen into the anatase structure starts at 500 °C, with N bonding to titanium via oxygen substitution. Increasing the treatment temperature leads to the formation of TiN (TiN1–xOx) and N‐doped rutile showing mixed‐valence Ti states. Microstructural characterization shows that the ordered mesoporosity is maintained until 700 °C, where TiN (TiN1–xOx) begins to form. Optical characterization shows that the discrete introduction of N is able to shift the titania absorption edge. The photocatalytic tests give the best results under visible light excitation for the film nitrided at 500 °C. At this temperature the concentration of nitrogen in the structure is optimal since oxygen vacancies are still not important enough to promote the recombination of the photogenerated electrons and holes.

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Section: Introductionmentioning

confidence: 99%

Nanostructured Titanium Oxynitride Porous Thin Films as Efficient Visible‐Active Photocatalysts

Martínez‐Ferrero¹,

Sakatani²,

Boissière³

et al. 2007

Adv Funct Materials

174

133

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“…Several authors have reported a broad peak from 397 to 403 eV, which after curve fitting analysis deconvolutes into two peaks at 396 and 400 eV. The peak at 396 eV can be assigned to the nitridic nitrogen in the O-Ti-N linkage (Cong et al 2007a;Mitoraj and Kisch 2008;Wu et al 2005). Signal at 400 eV result from N-N, N-O, or N-C groups (Mitoraj and Kisch 2008; and chemisorbed N 2 (Saha and Tompkins 1992;Yang et al 2006).…”

Section: Nitrogen-doped Tiomentioning

confidence: 99%

Semiconducting Materials

Hernández-Ramírez¹,

Medina-Ramírez²

2014

Photocatalytic Semiconductors

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Semiconducting materials are of great technological importance in electronics industry and environmental remediation due to their ability to generate charge carriers when activated with certain energy. The favorable combination of electronic structure, light absorption properties, charge transport characteristics, and excited lifetimes of some semiconductors has made possible its application as photocatalyst. Although many publications define the fundamental aspects of the semiconductors from different points of view, in this chapter the definition of photocatalytic semiconductor, its structural characteristics, and the requirements to be used as photocatalyst are briefly recalled. In addition, the classification of photocatalytic materials and the mechanism of the photocatalytic process are also reviewed. The advantages and disadvantages of the most used photocatalyst TiO 2 and the second-generation TiO 2 -based materials are also addressed.

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“…Various binary oxides, such as CdO-ZnO, CuO-CeO 2 , Al 2 O 3 -TiO 2 , Al 2 O 3 -ZnO, CoTiO 2 and N 2 -TiO 2 have been prepared and studied for structural, surface, optical and chemical properties [2][3][4][5][6]. Surface oxygen vacancies play an important role in the properties of such binary oxide thin films.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of pseudo binary oxides (TiO2)1-x-(Al2O3)x thin films prepared by spray pyrolysis technique

Chandrashekara

Angadi

Shashidhar

et al. 2016

Materials Today: Proceedings

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Pseudo binary oxide thin films,(TiO 2 ) 1-x -(Al 2 O 3 ) x, were prepared by spray pyrolysis technique on cleaned quartz and silicon substrates. The prepared precursor solutions of Al 2 O 3 and TiO 2 were mixed thoroughly in appropriate volume, calculated from the molar fraction. The XRD pattern of Al 2 O 3 -TiO 2 film shows anatase phase and mixed phase of Al 2 TiO 5 (Aluminum Titanium oxide). The SEM micrograph shows spherical grains with nano porous surface and some clusters, it is also composed of crumb like nano particles and average grain sizes are estimated. In the EDAX spectrum, the signals corresponding to oxygen (O 2 ), titanium (Ti), aluminum (Al) and substrate silicon (Si) are seen, elemental analysis shows that weight percentage are in stoichiometric ratio. Transmittance and Reflectance spectra were recorded in normal incidence by UV-Visible Spectrophotometer in wavelength range 350nm to 1200nm. Using these optical data the thickness, refractive index, extinction coefficient, real and imaginary part of dielectric constants, energy band gap, Urbach energy and Packing density are estimated. It is observed that, with the increase in molar fraction there is a variation of the energy band gap, which may be attributed to the mixed phase formation in the films as well as formation of defects. The obtained pseudo binary oxide thin films have wide band gap and porous surface structure; hence these films are further used for sensing application.

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Effects of nitrogen doping on optical properties of TiO2 thin films

Cited by 139 publications

References 22 publications

Nanostructured Titanium Oxynitride Porous Thin Films as Efficient Visible‐Active Photocatalysts

Nanostructured Titanium Oxynitride Porous Thin Films as Efficient Visible‐Active Photocatalysts

Semiconducting Materials

Optical properties of pseudo binary oxides (TiO2)1-x-(Al2O3)x thin films prepared by spray pyrolysis technique

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