Si doping effects on the photocatalytic activity of TiO2 nanotubes film prepared by an anodization process

Zhang, Y; Li, Xianfeng; Dong, Chaoyu; Ma, Naiheng; Hua, Xiaoshe; Wang, Haowei

doi:10.1016/j.scriptamat.2008.12.004

Cited by 46 publications

(23 citation statements)

References 20 publications

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“…Although various noble metals [9,12], transition metal ions [13], and non-metal [14,15] doped TiO 2 nanotubes have been successfully prepared, there have been a few reports on synthesizing rare-earth metal doped TiO 2 nanotubes. According to our knowledge, there are reports only about rare-earth metal europium [16], lanthanum [17] and neodymium [18] doped TiO 2 nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Xue

Zhang

et al. 2011

Chemical Engineering Journal

106

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Section: Introductionmentioning

confidence: 99%

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Xue

Zhang

et al. 2011

Chemical Engineering Journal

106

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“…The average number of adsorbed molecules per geometric surface area unit participating in the SERS measurements (N surf ) was calculated assuming that the adsorbed molecules are spheres closely packed on a plane (a monolayer) to form a hexagonal lattice (densest packing) [19,49]; formula (2):…”

Section: Sers Measurementsmentioning

confidence: 99%

“…The growing interest in titania and alumina nanoporous materials is due to their wide application in such fields as photocatalysis (TiO 2 ) [1][2][3], electrocatalysis (TiO 2 ) [4][5][6], lithography (Al 2 O 3 ) [7,8] and optoelectronics (TiO 2 , Al 2 O 3 ) [3,6,9], and also as self-cleaning coatings (TiO 2 ) [3], bio-sensor coatings (TiO 2 ) [10] and biomedical materials (TiO 2 ) [11][12][13]. Nanoporous layers of alumina are widely used as 'templates/matrices' for creating metallic nanofibres, semi-conductors and conductive polymers [7,8].…”

Section: Introductionmentioning

confidence: 99%

TiO2 and Al2O3 nanoporous oxide layers decorated with silver nanoparticles—active substrates for SERS measurements

Pisarek

Hołdyński

Roguska

et al. 2014

J Solid State Electrochem

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Self-organized nanoporous oxide layers (TiO 2 , Al 2 O 3 ) exhibiting specific properties, obtained by anodic oxidation at a constant voltage in neutral electrolyte, may serve as attractive SERS substrates for investigating the interactions between an adsorbate and adsorbent, or as a stable platform for detecting various organic compounds. This paper presents the influence of the size of the nanotubes/nanopores and the structure of the porous oxide layers on the SERS enhancement factor, E F . We used pyridine and mercaptobenzoic acid as probe molecules, since they have a large cross-section for Raman scattering. To characterize the morphology and structure of the oxide layer substrates, before and after vacuum vapor deposition of silver nanoparticles, we applied scanning electron microscopy, X-ray diffraction and surface analytical techniques: AES, XPS and SERS. The results obtained show that for the same amount of Ag (0.02 mg/cm 2 ) the size of the nanopores significantly affects the E F , which reaches, at a properly chosen nanopore size, distinctly higher values than that characteristic of a standard silver surface roughened by electrochemical cycling, i.e. E F >10 6 . The new Ag/MeO x -NT composites layer, ensure a good reproducibility of the SERS measurements and exhibit stability over a limited period of time.

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“…Among them, TiO 2 -SiO 2 mixed oxide (Ti-Si binary oxides, hereinafter) has been extensively explored, and significant progresses have been made in understanding these properties, such as enhanced catalytic activity [3,4], photocatalytic activity [5][6][7][8][9][10][11], photoelectrochemical property [11][12][13][14], persistent and regenerable super-hydrophilicity [15], antimicrobial activity [16], solar energy conversion [17], photocatalytic water splitting and hydrogen production [18]. Currently, the most practical application of nanosize TiO 2 in photocatalysis mainly focuses on selfcleaning coatings and antibacterial coatings, such as in the mirrors of roads, bathrooms and vehicles, the cover glass of windows, road lighting and greenhouses, the tiles in kitchen and bathrooms, the exterior tiles on the roof and wall of buildings, and the garments and uniforms of medical and hospital [19], despite some problems about nanometer TiO 2 have made some applications difficult and costly.…”

Section: Introductionmentioning

confidence: 99%

“…For the enhanced photocatalytic activity and hydrophilicity, the most latter researches believed that it possibly came from following aspects: (a) the formation of Ti-O-Si linkages which efficiently separated the photo-generated electrons and holes [11,12,[14][15][16][17][18]; (b) the formation of highly distributed tetrahedral TiO 2 clusters [2,6,22], in which Ti 4? can be excited to the Ti 3? under UV irradiation and act as electron traps or chemisorbed center for O 2 and H 2 O [11]; (c) the formation of sub-oxide species of Ti, which can chemosorb more H 2 O and OH [3,23]; (d) the formation of large pore volume and high surface area which can hold higher concentration of hydroxyl groups [24]; (e) the formation of nanocrystalline TiO 2 with quantum efficiencies [25].…”

Section: Introductionmentioning

confidence: 99%

Comparison study on surface depth distribution of chemical species of different nanocomposite Ti–Si binary oxides

Wang

Liu

Meng

et al. 2016

J Sol-Gel Sci Technol

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Two depths of surface of three kinds of 10 % SiO 2 Ti-Si binary oxide powder, prepared by three kinds of sol-gel processes and annealed at higher temperature, are comparatively studied by ARXPS, SEM and HRTEM. ARXPS shows that the two depths of surface for all samples enrich in Si about 38.2-63.2 % and are the mixture of TiO x (x B 2), SiO y (y B 2), Ti-O-Si, adsorbed O-containing species and C-containing species. With increasing depth, the change of Si/Ti ratio closely relates to the original structure formed in sol-gel. The surface contents of SiO 2 and Ti-O-Si linkages increase in depth for all samples. The surface of silica-supported titania and intimately mixed silica-titania has more sub-valence Ti and Si than that of silica-coated titania, but the surface of silicacoated titania has higher concentration of Ti, O and C than that of the other two. ARXPS and SEM images consistently confirm that the surface of silica-coated titania is a porous structure. HRTEM verifies that nanocrystalline anatase TiO 2 with many crystal defects has been produced in silicacoated titania.Graphical Abstract Three nanocomposite silica-titania binary oxide powders with three different structures were synthesized by three different sol-gel processes and analyzed by ARXPS, SEM and HRTEM. As it shows that the surface of silica-coated titania is a porous structure with more O and C, the surfaces of intimately mixed silicatitania and silica-supported titania, respectively, conglomerate and sinter with more suboxide Ti and Si.

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Si doping effects on the photocatalytic activity of TiO2 nanotubes film prepared by an anodization process

Cited by 46 publications

References 20 publications

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

Preparation of titania nanotubes doped with cerium and their photocatalytic activity for glyphosate

TiO2 and Al2O3 nanoporous oxide layers decorated with silver nanoparticles—active substrates for SERS measurements

Comparison study on surface depth distribution of chemical species of different nanocomposite Ti–Si binary oxides

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