Visible light photocatalysis with nitrogen-doped titanium dioxide nanoparticles prepared by plasma assisted chemical vapor deposition

Abstract

Visible light photocatalytic activity in nitrogen-doped TiO 2 nanobelts Appl. Phys. Lett. 94, 093101 (2009); 10.1063/1.3093820 Hydrothermal synthesis and visible light photocatalysis of metal-doped titania nanoparticles Structure and size distribution of TiO 2 nanoparticles deposited on stainless steel mesh Nitrogen-doped TiO 2 nanoparticles were synthesized via plasma assisted metal organic chemical vapor deposition. Nitrogen dopant concentration was varied from 0 to 1.61 at. %. The effect of nitrogen ion doping on visible light photocatalysis has been investigated. Samples were analyzed by various analytical techniques such as x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy, and near-edge x-ray absorption fine structure. Titanium tetraisopropoxide was used as the titanium precursor, while rf-plasma-decomposed ammonia was used as the source for nitrogen doping. The N-doped TiO 2 nanoparticles were deposited on stainless steel mesh under a flow of Ar and O 2 gases at 600°C in a tube reactor. The photocatalytic activity of the prepared N-doped TiO 2 samples was tested by the degradation of 2-chlorophenol ͑2-CP͒ in an aqueous solution using a visible lamp equipped with an UV filter. The efficiency of photocatalytic oxidation of 2-CP was measured using high performance liquid chromatography. Results obtained revealed the formation of N-doped TiO 2 samples as TiO 2−x N x , and a corresponding increase in the visible light photocatalytic activity.

Visible-light photocatalytic activity of nitrogen-doped TiO2 thin film prepared by pulsed laser deposition

“…The separation between the Ti2p3/2 and Ti2p1/2 peaks is consistent with the formation of TiO 2 [28]. The Ti2p3/2 and Ti2p1/2 peaks show slight left shifts in their positions from those located at 458.5 eV and 464.2 eV for tetravalent Ti 4+ of TiO 2 [28], respectively, and these shifts are similar to that reported by Buzby et al [31]. According to their analysis the shift in the binding energy may be understood as the presence of Ti-N bonds formed from N dopant substitution, since the corresponding values of Ti for TiN are 454.9 eV and 460.64 eV [32] are much smaller than those for tetravalent Ti 4+ of TiO 2 [31].…”

One step synthesis of N-doped and Au-loaded TiO2 nanoparticles by laser pyrolysis: Application in photocatalysis

“…Its intensity slightly increases in correlation with increasing gold content. This band is usually assigned to the plasmon resonance of gold nanoparticles [30]. In the frame of the Mie theory, for spherical particles of small size compared to the wavelength , the absorption cross section of a single nanoparticle embedded in a homogeneous medium is [44], where Im() stands for imaginary part, corresponds to the particle radius, and correspond to the complex refractive indices of respectively the particle and the medium.…”

“…Nitrogen was reported as the most promising dopant [27,29]. Buzby et al [30] and Shang et al [31] showed that N-TiO 2 NPs increased visible light activity for the degradation of 2 and 4-chlorophenol respectively. However, the combination of these two effects (noble metal and nitrogen doping) has not been extensively studied.…”

The electronic and magnetic structure of p-element (C,N) doped rutile-TiO2; a hybrid DFT study

“…Once the CO and NO dimers are formed, nitrogen remains with 1l B while carbon is non-magnetic. Test [42][43][44][45][46].…”