Enhanced visible-light absorption from Ag2O nanoparticles in nitrogen-doped TiO2 thin films

The synthesis of surface defect TiO2-x nanobelts with excellent visible light absorption is important to reduce costs, increase stability, and improve photocatalytic activity. In this work, we report that nitrogen-doped surface defect TiO2-x nanobelts are synthesized by annealing pristine TiO2 nanobelts in Ar/H2 (95%/5%) atmosphere followed by subsequent heat treatment in NH3 at various temperatures. The aim is to study the effect of the extent of the N-doping amount in the lattice of TiO2-x nanobelts on light absorption and photocatalytic activity. Considering the increase in organic pollutants in wastewater, the photocatalytic activity is measured by degrading rhodamine B (RhB) dye in water. The results demonstrate that the calcination temperature affects the doping level of N, and the b-TiO2-N550 sample exhibits higher photocatalytic performance than that of other samples under visible-light irradiation for the degradation of rhodamine B, which is up to 96.11%. The enhancement is ascribed to the synergistic effect of N-doping and self-doping oxygen vacancy (which extend the visible light absorption) and the separation efficiency of photogenerated carriers, which improves the photocatalytic activity.

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Enhanced visible-light absorption of nitrogen-doped titania induced by shock wave

Materials Letters ◽

10.1016/j.matlet.2010.11.020 ◽

2011 ◽

Vol 65 (4) ◽

pp. 685-687 ◽

Cited By ~ 6

Author(s):

Xiang Gao ◽

Pengwan Chen ◽

Jianjun Liu

Keyword(s):

Shock Wave ◽

Visible Light ◽

Light Absorption ◽

Visible Light Absorption ◽

Nitrogen Doped ◽

Doped Titania

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A Study on the Preparation of TiO2-xNx Films by Reactive Deposition and Their Absorption Properties in Visible Region

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.1223 ◽

2005 ◽

Vol 475-479 ◽

pp. 1223-1226 ◽

Cited By ~ 1

Author(s):

Ming Zhao ◽

Da Ming Zhuang ◽

Gong Zhang ◽

Ling Fang ◽

Min Sheng Wu

Keyword(s):

Thin Films ◽

Magnetron Sputtering ◽

Absorption Edge ◽

Visible Region ◽

Reactive Magnetron Sputtering ◽

Tio2 Films ◽

Reactive Magnetron ◽

Tio2 Thin Films ◽

Doped Tio2 ◽

Nitrogen Doped

The nitrogen-doped TiO2 thin films were prepared by mid-frequency alternative reactive magnetron sputtering technique. The N concentration of the nitrogen-doped TiO2 thin films was analyzed by XPS. And the absorption spectra of the films in ultraviolet and visible region were also investigated. The results show that the mid-frequency alternative reactive magnetron sputtering technique is a convenient method for growing TiO2-xNx. Annealing the nitrogen-doped TiO2 thin film in nitrogen atmosphere under 380°C is helpful for increase the concentration of nitrogen in the film, but the ratio of N2 in reactive gas is mainly influence the concentration of nitrogen in the Ti-N bond in the TiO2 film. The increase of the thickness of nitrogen-doped TiO2 films will enhance the absorbability of the film in the ultraviolet and visible region. The wavelength of the absorption edge of TiO2-xNx film with 1.5% nitrogen shift to 441nm from 387nm, which is the absorption edge for undoped TiO2 films.

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