Book Review

Mills, Jerry L.

doi:10.1111/j.1751-1097.1982.tb02669.x

Cited by 204 publications

(288 citation statements)

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“…Simultaneously, holes diffuse from the p-type to the n-type region, creating a positive section in the ntype region in the vicinity of the junction. For this situation, the Pt metal must have a higher work function (5.6 eV) than that of the TiO 2 semiconductor (~3.9 eV) [8,113], which renders to form a Schottky barrier between the metal and semiconductor. Fig.…”

Section: Noble Metal Depositionmentioning

confidence: 99%

“…The effective photoexcitation of TiO 2 photocatalysts requires the application of light with energy higher than its band-gap energy [7,8], thus resulting in the formation of electrons (e or oxidant (electron acceptor) is available to trap the hole or electron, recombination is prevented and subsequent photocatalytic reactions may occur efficiently on the semiconductor surface. Actually, photocatalytic reactions may occur by either directly via the valence-band hole or indirect oxidation via the surface-bound hydroxyl radicals (i.e., a trapped hole at the particle surface reacts with HO -or H 2 O to be transformed into •OH) [9].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

Liang

Nowotny

2010

SSP

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Titanium dioxide (TiO 2 ) nanotubes have been reported one decade ago and have proven to be of a great interest in photocatalytic water splitting, as well as gas sensing and antibacterial/cancer treatment. This paper presents an overview on general preparation approaches (chemical treatment, template method and anodic oxidation) of tubular TiO 2 nanoarchitectures and their characterization. Current applications of the nanotubes as photocatalysts are also reviewed.

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Section: Noble Metal Depositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

Liang

Nowotny

2010

SSP

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“…1,2,3,4,5,6 Of the semiconducting materials, ZnO offers significant opportunity in providing electronic, photonic, and spin-based functionality (spintronics) because of its direct wide band gap (3.37 ev) and large exciton binding energy of ~60 meV. This makes it worthy in the potential and established hi-tech applications such as ceramics, piezoelectric transducers, optical coatings, high speed and display devices, 7,8,9,10 gas sensors, 11 varistors, 12, 13 photocatalysts 14 and photovoltaics.…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient Ag-ZnO Photocatalyst: Synthesis, Properties, and Mechanism

2008

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Highly photocatalytically active silver-modified ZnO has been prepared and the effect of silver modification was studied. The structural and optical properties were characterized by X-ray diffraction, Fourier transform IR, differential scanning calorimetry, BET surface area, Raman, UV-vis, and photoluminescence spectroscopy. The photocatalytic activity of these materials was studied by analyzing the degradation of an organic dye, rhodamine 6G (R6G), and it is found that 3 mol % silver-modified ZnO at 400 °C shows approximately four times higher rate of degradation than that of unmodified ZnO and a three times higher rate than that of commercial TiO 2 photocatalyst Degussa P-25. It was also noted that the photocatalytic activity for the modified ZnO sample was five times higher than the unmodified sample using sunlight. The effect of silver in enhancing the photocatalytic activity has been studied by analyzing the emission properties of both ZnO and silvermodified ZnO in the presence (emission increases) and absence (emission decreases) of R6G. We attribute these observations to the extent of valence band hole production and the role of silver in trapping the conduction band (CB) electrons in the absence of R6G. In the presence of R6G, the dye preserves the CB electron population in the metal oxide, thus preserving and enhancing emission intensity. The sensitizing property of the dye and electron scavenging ability of silver together constitute to the interfacial charge transfer process in such a way to utilize the photoexcited electrons.

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“…This generates an electron (e -) in the CB and leaves behind a hole (h + ) in the VB [1,2]. The former can act as a reductant and the latter as an oxidant in the different photocatalytic and photosynthetic processes being considered, e.g.…”

mentioning

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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Book Review

Cited by 204 publications

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Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

A Highly Efficient Ag-ZnO Photocatalyst: Synthesis, Properties, and Mechanism

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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Book Review

Cited by 204 publications

References 0 publications

Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

Photocatalytical Properties of TiO<sub>2</sub> Nanotubes

A Highly Efficient Ag-ZnO Photocatalyst: Synthesis, Properties, and Mechanism

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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Product

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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