Improved optical response and photocatalysis for N-doped titanium oxide (TiO2) films prepared by oxidation of TiN

Wan, Lin; Li, J.F.; Feng, Jingyang; Sun, Wei; Mao, Zongqiang

doi:10.1016/j.apsusc.2006.10.047

Cited by 63 publications

(41 citation statements)

References 22 publications

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“…27,28 Different techniques have been used to study N-doped TiO 2 crystallographically, including XPS, EPR, Raman spectroscopy, XRD, and absorption spectroscopy. [29][30][31] Theoretical studies have supported the visible absorption and the resulting yellowish color of TiO 2 /N thin films and powders. 32,33 Alternative techniques to increase the photoresponse besides doping include the utilization of tunable narrow band gap semiconductor nanoparticles or quantum dots (QDs) such as CdS, CdSe, and CdTe to sensitize wide band gap semiconductors such as the metal oxides, for example, TiO 2 and ZnO.…”

Section: Introductionmentioning

confidence: 98%

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications

et al. 2008

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Nitrogen-doped titanium dioxide (TiO 2 /N) nanoparticle thin films have been produced by a sol-gel method with hexamethylenetetramine (HMT) as the dopant source. The synthesized TiO 2 /N thin films have been sensitized with CdSe quantum dots (QDs) via a linking molecule, thioglycolic acid (TGA). Optical, morphological, structural, and photocurrent properties of the thin films with and without QD sensitization have been characterized by AFM, TEM, XPS, Raman spectroscopy, UV-visible spectroscopy, and photoelectrochemistry techniques. AFM measurements reveals that films with thicknesses of 150 and 1100 nm can be readily prepared, with an average TiO 2 particle size of 100 nm. TEM shows a uniform size distribution of CdSe QDs utilized in sensitizing the TiO 2 /N films. Doping of the TiO 2 crystal lattice by HMT was confirmed to be 0.6-0.8% by XPS. Differences in crystal phase caused by the precursors HMT, nitric acid, and poly(ethylene glycol) (PEG) are elucidated using XRD and Raman spectroscopy. The resultant crystal phase of TiO 2 /N varies but is a mixture of anatase, brookite, and rutile phases. UV-visible absorption spectra show that N doping of TiO 2 causes a red-shifted absorption into the visible region, with an onset around 600 nm. Nitrogen doping is also responsible for the enhanced photocurrent response of the TiO 2 /N nanoparticle films in the visible region relative to undoped TiO 2 films. In addition, CdSe QDs linked to TiO 2 /N nanoparticles using TGA were found to significantly increase the photocurrent and power conversion of the films compared to standard TiO 2 /N films without QD sensitization. The incident photon-to-current conversion efficiency (IPCE) is 6% at 400 nm for TiO 2 /N-TGA-CdSe solid-state solar cells and 95% for TiO 2 /N-TGA-CdSe films near 300 nm in a Na 2 S electrolyte, which is much higher than that of undoped TiO 2 with QD sensitization or TiO 2 /N without QD sensitization. The power conversion efficiency (η) was found to be 0.84% with a fill factor (FF%) of 27.7% with 1100 nm thick TiO 2 /N-TGA-CdSe thin films. The results show that combining nitrogen doping with the QD sensitization of TiO 2 thin films is an effective and promising way to enhance the photoresponse in the near-UV and visible region, which is important for potential photovoltaic (PV) and photoelectrochemical applications.

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Section: Introductionmentioning

confidence: 98%

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications

et al. 2008

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“…• C. 24 These suggest that tuning the optical band gap of the films in a wide range could be realized, which is of importance in applying TiO 2 as photocatalyst in the visible light.…”

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confidence: 99%

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Xie¹,

Liu²,

Zhan³

et al. 2013

AIP Advances

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TiO2-TiN composite catalysts were prepared by oxidizing the TiN films in air at 350 °C. By adjusting the oxidation time to control the oxidation stage of TiN films, the optical band gap of the TiO2-TiN composites can be varied in a wide range from 1.68 eV to 3.23 eV. These composite films all showed red shift in photo-response towards the visible region, and depending on the optical band gap, some composite films exhibited good catalytic activity in the visible light region. This study provides a simple but effective method to prepare film photocatalyst working in visible light

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“…The deposition rate was 48 nm/min in the absence of N 2 for Ta films and decreased to <10 nm/min when 10% of N 2 gas was present in the Ar-N 2 gas mixture. This decrease is attributed to the blocking of Ta-target surface active sites by N-atoms at higher N 2 partial pressure [23,27]. The N-content has been reported to increase up to Ta 3 N 5 [24] during the sputtering of TaN.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the similar radii, it is possible to discard nitride cation size considerations to rationalize the observed effect. But there is a significant difference in the potentials of TaN undergoing Ta 5+ /Ta 6+ redox reactions compared to TiN and ZrN undergoing M 3+ /M 4+ redox reactions [23][24][25][26][27][28][29][30][31][32][33][34]29]. The oxidation-reduction potential values for the Ta, Ti and Zr depend heavily on the nature of the composite compound they are found.…”

Section: E Coli Bacterial Reduction By Tan-pes and Ag-tan Pesmentioning

confidence: 99%

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Accelerated bacterial reduction on Ag–TaN compared with Ag–ZrN and Ag–TiN surfaces

Baghriche

Rtimi

Zertal

et al. 2015

Applied Catalysis B: Environmental

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a b s t r a c tAg-TaN sputtered on polyester (PES) accelerated >6 times the bacterial inactivation kinetics compared to TaN-PES under actinic light irradiation. Direct current pulsed magnetron sputtering (DCP) was used to sputter Ag-TaN-PES and TaN-PES. Complete bacterial reduction by Ag-TaN occurred within 20 min compared to Ag-TiN (100 min) and Ag-ZrN (90 min). The co-sputtering of Ag and Ta on PES was carried out in an Ar/N 2 10% atmosphere. By ion-coupled plasma mass-spectrometry (ICP-MS) a reduced Ag-release was observed for Ag-TaN samples compared to Ag-PES samples within the disinfection period. The redox catalysis by the Ag-species during the bacterial disinfection was followed by X-ray photoelectron spectroscopy (XPS). A bacterial reduction mechanism is suggested consistent with the experimental findings. The nitride films were characterized by surface science methods.

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Improved optical response and photocatalysis for N-doped titanium oxide (TiO2) films prepared by oxidation of TiN

Cited by 63 publications

References 22 publications

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Accelerated bacterial reduction on Ag–TaN compared with Ag–ZrN and Ag–TiN surfaces

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Improved optical response and photocatalysis for N-doped titanium oxide (TiO2) films prepared by oxidation of TiN

Cited by 63 publications

References 22 publications

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO2 Films for Solar Energy Conversion Applications

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO2 Films for Solar Energy Conversion Applications

Tuning the optical bandgap of TiO2-TiN composite films as photocatalyst in the visible light

Accelerated bacterial reduction on Ag–TaN compared with Ag–ZrN and Ag–TiN surfaces

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Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications

Nitrogen-Doped and CdSe Quantum-Dot-Sensitized Nanocrystalline TiO₂ Films for Solar Energy Conversion Applications