Modification of TiO2 photocatalytic films by V+ ion implantation

Hou, Xinggang; Hao, Feng-Huan; Fan, Bo; Gu, Xuenan; Xin, Wu; Liu, Andong

doi:10.1016/j.nimb.2005.07.195

Cited by 37 publications

(20 citation statements)

References 15 publications

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“…However, it should be noticed that the k decreases after annealing, so the photocatalytic efficiencies of V/TiO 2 and Cr/TiO 2 actually decrease rather than increase after annealing process. In the previous work [6], this phenomenon was not noticed for the weak visible light irradiation (1,400 LUX) and short experimental time (8 h).…”

Section: Photocatalytic Efficiency Of Tio 2 Films Modified By Beam Irmentioning

confidence: 68%

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Application of beam irradiation in preparation of visible light responsive TiO2 films

Hou

Liu

2007

Front. Chem. China

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TiO 2 films were prepared by sol-gel method. In order to improve the utilization of light, the technologies of implantation of transition metal ions (V + and Cr + ) and electron beam irradiation to deposit noble metal particles (Ag and Pt) were used. A red shift was found in the spectrum of modified TiO 2 films. The photocatalytic experiments showed that the photocatalytic ability under visible light irradiation could be improved dramatically by both the implantation of transition metal and the electron beam irradiation.

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Section: Photocatalytic Efficiency Of Tio 2 Films Modified By Beam Irmentioning

confidence: 68%

“…The photocatalytic TiO 2 films were prepared by dip-coating and sol-gel method [6], and the TiO 2 films for UV-Vis spectra were spin-coated on a quartz glass (2.5 mmx7 mm) by a spin-coater at 4,000 r/min.…”

Section: Preparation and Modification Of Tio 2 Photocatalytic Filmsmentioning

confidence: 99%

Application of beam irradiation in preparation of visible light responsive TiO2 films

Hou

Liu

2007

Front. Chem. China

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Section: D Transition Metal (V Cr and Fe) Ions Are Implanted Into Tmentioning

confidence: 99%

“…From the UV-Visible spectra, it could be found that a red shift in the band gap transition is induced by the metal doping of TiO 2 in the three cases. When the TiO 2 is doped with V, Cr and Fe, the absorption spectra shift to a lower energy region with an increase in the dopant concentration [7] . The red shift can be attributed to the charge-transfer transition via the 3d states of implanting ions located in the band gap of TiO 2 .…”

Section: Photoexcitation Processes Via the Impurity Statesmentioning

confidence: 99%

“…Impurity doping has been widely performed by chemical synthesis in order to create photocatalysts operating under visible light irradiation [3,4] . In recent years, many research results [5][6][7] show that ion implantation of 3d transition metal, such as V, Cr, and Fe, shifts the absorption edge to the visible region, thereby increasing photoactivity of TiO 2 in the visible region.In contrast to these previous experimental investigations, a theoretical analysis by computer simulation is expected to clarify in detail the impurity-doping effects.Computer simulations have been employed for this purpose by some researchers for about 5 years [8][9][10][11][12] . At the beginning of theoretical analysis, a cluster approach using a molecular orbital calculation was adopted.…”

mentioning

confidence: 99%

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First-principles calculations on implanted TiO2 by 3d transition metal ions

Hou

Huang

et al. 2009

Sci. China Ser. G-Phys. Mech. Astron.

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3d transition metal (V, Cr and Fe) ions are implanted into TiO 2 by the method of metal ion implantation.The electronic band structures of TiO 2 films doped 3d transition metal ions have been analyzed by ab initio band calculations based on a self-consistent full-potential linearized augmented plane-wave method within the first-principle formalism. Influence of implantation on TiO 2 films is examined by the method of UV-visible spectrometry. The results of experiment and calculation show that the optical band gap of TiO 2 films is narrowed by ion implantation. The calculation shows that the 3d state of V, Cr and Fe ions plays a significant role in red shift of UV-Vis absorbance spectrum.3d transition metal ions implantation, TiO 2 , FP-LAPW, electronic structure TiO 2 photocatalyst has been studied intensively in recent decades due to its non-toxic, long-term stability, strong oxidizing power and high photoactivity [1,2] . This material shows that it may lead to complete mineralization of pollutants to CO 2 , water and mineral acids. However, the drawback of TiO 2 is that it can be activated only by ultraviolet (UV) light because of its wide band gap (3.2 eV for anatase). The ultraviolet light reaching the earth surface is less than 5% of the solar energy, which is too low to attain significant photoactivity for TiO 2 . The effective utilization of visible light, therefore, is one of the important subjects for the increased utility of TiO 2 as a photocatalyst. Impurity doping has been widely performed by chemical synthesis in order to create photocatalysts operating under visible light irradiation [3,4] . In recent years, many research results [5][6][7] show that ion implantation of 3d transition metal, such as V, Cr, and Fe, shifts the absorption edge to the visible region, thereby increasing photoactivity of TiO 2 in the visible region.In contrast to these previous experimental investigations, a theoretical analysis by computer simulation is expected to clarify in detail the impurity-doping effects.Computer simulations have been employed for this purpose by some researchers for about 5 years [8][9][10][11][12] . At the beginning of theoretical analysis, a cluster approach using a molecular orbital calculation was adopted. Nishikawa et al. [8] carried out the calculation using the DV-Xα methods in the case of V-, Cr-, Mn-, Fe-, Co-, Ni-or Rh-doping, and then discussed the relationship between the impurities and band gap. In recent years, a method based on the functional theory (DFT) was used to analyze the electronic structures of the ion-doped TiO 2 [9][10][11][12] . Wang et al. [10] calculated the electronic structures of Nor Nb-doped TiO 2 by full-potential linearized augmented plane-wave (FP-LAPW) method to examine band gap energies depending on the impurity positions in a cluster. Umebayshi et al. [9] also reported the electronic structures of 3d transition metal-doped rutile by this method using super-cell approach. However, it has been few about investigations on the band structure of 3d transition metal-...

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Gliding Arc Plasma Synthesis of Visible‐Light Active C‐Doped Titania Photocatalysts

Liu

et al. 2014

Plasma Processes & Polymers

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Gliding arc plasma is explored to synthesize C-doped TiO 2 photocatalysts via tuning the ratio of O 2 to titanium tetraisopropoxide (TTIP) for the first time. XRD and HRTEM characterizations confirm that the samples synthesized at O 2 /TTIP ! 18 are highly crystalline. When the O 2 /TTIP ratio ranges from 18 to 36, the as-synthesized samples with $70% of the weight fraction of anatase, 40-50 m 2 g À1 of specific surface area and $2.

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Modification of TiO2 photocatalytic films by V+ ion implantation

Cited by 37 publications

References 15 publications

Application of beam irradiation in preparation of visible light responsive TiO2 films

Application of beam irradiation in preparation of visible light responsive TiO2 films

First-principles calculations on implanted TiO2 by 3d transition metal ions

Gliding Arc Plasma Synthesis of Visible‐Light Active C‐Doped Titania Photocatalysts

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