A novel preparation of iron-doped TiO2 nanoparticles with enhanced photocatalytic activity

Wang, Chuanyi; Bahnemann, Detlef W.; Dohrmann, J. K.

doi:10.1039/b002988m

Cited by 222 publications

(132 citation statements)

References 11 publications

(11 reference statements)

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“…Thus, based on the element concentration determined by Auger and the energy gap estimation from the UV-Vis spectra, we conclude that as the Fe content in the TiO2 increases (to 19.6, 31.8 and 35.9 at %), the optical absorption threshold shits towad visible light wave lengths, consequently the energy gap of the TiO 2 -Fe 2 O 3 , decreases to E g = 3.66, 2.84, 2.59 and 2.37 eV correspondingly. Similar effects have been reported by Hirano et al [11] and Wang et al [13] for Fe/TiO 2 powders. …”

Section: Uv-vis Absorptionsupporting

confidence: 82%

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Sánchez-Mora¹,

Gómez-Barojas

Gracia‐Jiménez

et al. 2004

phys. stat. sol. (c)

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We report the synthesis of Fe 2 O 3 -TiO 2 thin films obtained with the sol-gel method by varying the Fe 2 O 3 wt% in the growing solution to 0, 25, 50 and 75. Glass was used as substrate. The films were characterized by means of the FTIR, Auger and UV-Vis spectroscopies. The results show that the Fe 2 O 3 -TiO 2 films are partially hydroxylated, the Fe incorporation into TiO 2 modify the optical properties by means of the Ti +4 reduction to Ti +3 species, and that the Fe concentration in the films increases when the Fe 2 O 3 concentration in the growing solution is increased.1 Introduction In recent years, Titanium Dioxide (TiO 2 ) has been extensively studied for its interesting electronic, photocatalytic and electrochemical properties [1][2][3]. In photocatalysis, the TiO 2 is the most promising catalyst due to its high efficiency, stability and low cost. Nevertheless, some disadvantages of TiO 2 for industrial applications are the necessity of filtration after the degradation process and that it is photoactive in the near UV range. To overcome the former disadvantage the TiO 2 can be prepared in thin film form which can be used in surface water and ground water purification. To skip the later disadvantage some researchers have proposed to dope the TiO 2 with transition metal ions in order to extend the absorption threshold to the visible light region. The sol-gel process has been used to prepare polymeric materials such as metal oxides. Its advantage is that during the first stage of the reaction it is possible to incorporate active metals, so that the product will be a material with the metal dispersed on the oxide. In addition, some part of this metal is incorporated in the oxide matrix modifying the physical, chemical, optical and photocatalytic properties [4].In this work we report the synthesis of Fe 2 O 3 -TiO 2 layers grown by the sol-gel method on glass substrates and the effect of varying the Fe 2 O 3 concentration in the growing solution on the chemical composition and optical properties of the layers. The characterization techniques used in this work are FTIR, UV-Vis and AES.

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Section: Uv-vis Absorptionsupporting

confidence: 82%

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Sánchez-Mora¹,

Gómez-Barojas

Gracia‐Jiménez

et al. 2004

phys. stat. sol. (c)

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“…18 TiO 2 is one of the important oxide semiconductors and is proved to be suitable for photocatalytic, optical, and sensing applications. 19,20 Hybrid SiNWs and TiO 2 nanoparticles (NPs) have shown enhanced electrical and photodetection properties. 12 Other nanoparticles decorated nanostructures have also been investigated to improve electrical, dielectric, thermoelectric, and photodetection properties.…”

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confidence: 99%

Charge injection and trapping in TiO2 nanoparticles decorated silicon nanowires arrays

Rasool

Rafiq

Ahmad

et al. 2015

Applied Physics Letters

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We investigate carrier transport properties of silicon nanowire (SiNW) arrays decorated with TiO2 nanoparticles (NPs). Ohmic conduction was dominant at lower voltages and space charge limited current with and without traps was observed at higher voltages. Mott’s 3D variable range hoping mechanism was found to be dominant at lower temperatures. The minimum hopping distance (Rmin) for n and p-SiNWs/TiO2 NPs devices was 1.5 nm and 0.68 nm, respectively, at 77 K. The decrease in the value of Rmin can be attributed to higher carrier mobility in p-SiNWs/TiO2 NPs than that of n-SiNWs/TiO2 NPs hybrid device

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“…A wide variety of dopants have been studied including both metallic and non-metallic elements [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Doping of TiO 2 with non-metals (specifically C and N) has attracted significant attention [11, 12, 14, 15, 17-19, 21, 23-25].…”

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confidence: 99%

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

Neville¹,

Mattle

Loughrey³

et al. 2012

J. Phys. Chem. C

118

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A series of C-doped, W-doped, and C,W-codoped TiO2 samples have been prepared using modified sol–gel techniques. Reproducible inexpensive C-doping arises from the presence of melamine borate in a sol–gel mixture, whereas W-doping is from the addition of tungstic acid to the sol. The materials have been characterized using elemental analysis, N2 physisorption (BET), thermogravimetric analysis, X-ray diffraction, Raman, X-ray photoelectron, UV–vis spectroscopies, and photocatalytic activity measurements. Doping C and W independently results in an increased absorbance in the visible region of the spectrum with a synergistic effect in increased absorbance when both elements are codoped. The increased visible-light absorbance of the W-doped or codoped materials is not reflected in photocatalytic activity. Visible-light-induced photocatalytic activity of C-doped material was superior to that of an undoped catalyst, paving the way for its application under only visible-light irradiation conditions. A significant fraction of the spectral red shift commonly observed with doped catalysts might be due to the formation of color centers as a result of defects associated with oxygen vacancies, and bandgap-related narrowing or intragap localization of dopant levels are not the only factors responsible for enhanced visible-light absorption in doped photocatalysts. Furthermore, bandgap narrowing through increases in the energy of the valence band may actually decrease photo-oxidation activity through a curtailment of one route of oxidation.

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A novel preparation of iron-doped TiO2 nanoparticles with enhanced photocatalytic activity

Cited by 222 publications

References 11 publications

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Charge injection and trapping in TiO2 nanoparticles decorated silicon nanowires arrays

Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

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A novel preparation of iron-doped TiO2 nanoparticles with enhanced photocatalytic activity

Cited by 222 publications

References 11 publications

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Synthesis and characterization of Fe2O3–TiO2 thin films grown by the sol–gel method

Charge injection and trapping in TiO2 nanoparticles decorated silicon nanowires arrays

Carbon-Doped TiO2 and Carbon, Tungsten-Codoped TiO2 through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis

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Carbon-Doped TiO₂ and Carbon, Tungsten-Codoped TiO₂ through Sol–Gel Processes in the Presence of Melamine Borate: Reflections through Photocatalysis