Band gap narrowing of TiO2 by nitrogen doping in atmospheric microwave plasma

Hong, Yong Cheol; Bang, Chan Uk; Shin, Dong Hun; Uhm, Han S.

doi:10.1016/j.cplett.2005.08.027

Cited by 106 publications

(37 citation statements)

References 18 publications

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“…The N 1s XPS peaks at 398.2 eV [3], 400 eV [28] and 401.5 eV [29] were assigned to the formation of N-Ti-O linkages. However, the peaks at 400±0.2 eV [12], 401 eV [30] and 402 eV [31] were assigned to the chemisorbed molecular c-N state. Additionally, the N 1s core level at 400 eV [7] and 400.2 eV [32] for the N-doped TiO 2 were attributed to NO-like species.…”

Section: Characterization Of N-doped and N-s-codopedmentioning

confidence: 98%

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Xie

Zhao

et al. 2007

Catal Lett

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This paper reports a new method to prepare the N-doped and N-S-codoped anatase TiO 2 photocatalysts at 100°C. The as-prepared photocatalysts were characterized by means of XRD, Raman spectra, TEM, BET, UV-Vis diffuse reflectance spectra (DRS) and XPS. The results showed that the N-doping and N-S-codoping extended the absorbance spectra of TiO 2 into visible region with different extent. The BET surface area of the N-S-codoped TiO 2 photocatalysts was high up to 245 m 2 g -1 . The results of degradation of methyl orange (MO) solution showed that the N-doped and N-S-codoped TiO 2 photocatalysts exhibited higher photocatalytic activity than that of Degussa P-25 and the as-prepared pure TiO 2 under visible irradiation. This property can be attributed to the results of synergetic effects of absorption in the visible light region, red shift in adsorption edge, good crystallization and large surface area of the as-prepared N-doped or N-S-codoped TiO 2 .

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Section: Characterization Of N-doped and N-s-codopedmentioning

confidence: 98%

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Xie

Zhao

et al. 2007

Catal Lett

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“…8). Band gap narrowing by nitrogen incorporation has been previously observed in different transition metal oxynitrides [9,10,12,15,16,38].…”

Section: Optical Propertiesmentioning

confidence: 99%

Structural, optical, and electrical properties of WOx(Ny) films deposited by reactive dual magnetron sputtering

Mohamed

Anders

2006

Surface and Coatings Technology

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Thin films of tungsten oxynitrides were prepared by dual magnetron sputtering of tungsten using argon/oxygen/nitrogen gas mixtures with various nitrogen/oxygen ratios.The presence of even relatively small amounts of oxygen led to close-to-stoichiometric WO 3 , with little incorporation of nitrogen, therefore the films were labeled as WO x (N y ). Oxygen had a great effect not only on the composition but on the structure of WO x (N y ) films, as shown by Rutherford backscattering and x-ray diffraction, respectively. Significant incorporation of nitrogen occurred only when the nitrogen partial pressure exceeded 89% of the total reactive gas pressure. Sharp changes in the stoichiometry, deposition rate, room temperature resistivity, electrical activation energy and optical band gap were observed when the nitrogen/oxygen ratio was high. The deposition rate increased from 0.31 to 0.89 nm/s, LBNL-59900 1 the room temperature resistivity decreased from 1.65 × 10 8 to 1.82 × 10 -2 Ωcm, the electrical activation energy decreased from 0.97 to 0.067 eV, and the optical band gap decreased from 3.19 to 2.94 eV upon nitrogen incorporation into the films. WO x (N y ) films were highly transparent as long as the nitrogen incorporation was low, and were brownish (absorbing) and partially reflecting as nitrogen incorporation became significant.

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“…Its wide band gap (3.0 -3.2 eV) limits its photoresponse in the ultraviolet region which is only a small fraction (~5%). Therefore, several attempts were made to extend its optical response to the visible spectral range by doping with transition metal [19,20], nitrogen [21,22], and sulfur [23]. Recently, it has been reported that carbon modification of n-TiO 2 lowered its bandgap energy to 2.32 eV, and thereby exhibited higher photoresponse [3].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst

Shaban¹

2013

MRC

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The simultaneous photocatalytic production of hydrogen and degradation of naphthalene in seawater was successfully achieved using carbon modified titanium oxide (CM-n-TiO 2 ) nanoparticles under natural sunlight illumination. Compared to unmodified titanium oxide (n-TiO 2 ), CM-n-TiO 2 nanoparticles exhibited significantly higher photocatalytic efficiency. It is considered that carbon modification is responsible for the significant enhancement in the observed photoactivity. The experimental results indicated that the simultaneous production of hydrogen and degradation of naphthalene was favorable at pH 8 and optimal catalyst dose of 1.0 g·L . The solar photocatalytic degradation of naphthalene in seawater using CM-n-TiO 2 successfully fitted using Langmuir-Hinshelwood model, and can be described by pseudo-first order kinetic model.

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Band gap narrowing of TiO2 by nitrogen doping in atmospheric microwave plasma

Cited by 106 publications

References 18 publications

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Structural, optical, and electrical properties of WOx(Ny) films deposited by reactive dual magnetron sputtering

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst

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Band gap narrowing of TiO2 by nitrogen doping in atmospheric microwave plasma

Cited by 106 publications

References 18 publications

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Low Temperature Preparation and Characterization of N-doped and N-S-codoped TiO2 by Sol–gel Route

Structural, optical, and electrical properties of WOx(Ny) films deposited by reactive dual magnetron sputtering

Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO&lt;sub&gt;2&lt;/sub&gt; Photocatalyst

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Simultaneous Hydrogen Production with the Degradation of Naphthalene in Seawater Using Solar Light-Responsive Carbon-Modified (CM)-n-TiO<sub>2</sub> Photocatalyst