Author: Athil Khairi J. Al-Shihabi Al-AniPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Novel TiO2 Nanotube Arrays for Photoelectrocatalysis Application
Author: Athil Khairi J. Al-Shihabi Al-AniPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
TiO2 Nanotube Arrays
Author: Craig A. GrimesPublisher: Springer Science & Business Media
ISBN: 1441900683
Category : Technology & Engineering
Languages : en
Pages : 380
Book Description
TiO2 Nanotube Arrays: Synthesis, Properties, and Applications is the first book to provide an overview of this rapidly growing field. Vertically oriented, highly ordered TiO2 nanotube arrays are unique and easily fabricated materials with an architecture that demonstrates remarkable charge transfer as well as photocatalytic properties. This volume includes an introduction to TiO2 nanotube arrays, as well as a description of the material properties and distillation of the current research. Applications considered include gas sensing, heterojunction solar cells, water photoelectrolysis, photocatalytic CO2 reduction, as well as several biomedical applications. Written by leading researchers in the field, TiO2 Nanotube Arrays: Synthesis, Properties, and Applications is a valuable reference for chemists, materials scientists and engineers involved with renewable energy sources, biomedical engineering, and catalysis, to cite but a few examples.
TiO2 Nanotube Arrays for Photocatalysis
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
To furnish insight into correlations of electronic and local structure and photoactivity, arrays of short and long TiO2 nanotubes were synthesized by electrochemical anodization of Ti foil, followed by thermal treatment in O2 (oxidizing), Ar (inert), and H2 (reducing) environments. The physical and electronic structures of these nanotubes were probed with x-ray diffraction, scanning electron microscopy, and synchrotron-based x-ray absorption spectroscopy, and correlated with their photocatalytic properties. The photocatalytic activity of the nanotubes was evaluated by monitoring the degradation of methyl orange under UV-VIS light irradiation. Results show that upon annealing at 350 °C all as-anodized amorphous TiO2 nanotube samples partially transform to the anatase structure, with variations in the degree of crystallinity and in the concentration of local defects near the nanotubes' surface (~5 nm) depending on the annealing conditions. Degradation of methyl orange was not detectable for the as-anodized TiO2 nanotubes regardless of their length. The annealed long nanotubes demonstrated detectable catalytic activity, which was more significant with the H2-annealed nanotubes than with the Ar- and O2-annealed nanotube samples. This enhanced photocatalytic response of the H2-annealed long nanotubes relative to the other samples is positively correlated with the presence of a larger concentration of lattice defects (such as Ti3+ and anticipated oxygen vacancies) and a slightly lower degree of crystallinity near the nanotube surface. These physical and electronic structural attributes impact the efficacy of visible light absorption; moreover, the increased concentration of surface defects is postulated to promote the generation of hydroxyl radicals and thus accelerate the photodegradation of the methyl orange. The information obtained from this study provides unique insight into the role of the near-surface electronic and defect structure, crystal structure, and the local chemical environment on the photocatalytic activity and may be employed for tailoring the materials' properties for photocatalysis and other energy-related applications.
Recent Advances in TiO2 Nanotube-Based Materials for Photocatalytic Applications Designed by Anodic Oxidation
Author: Phuoc Huu LePublisher:
ISBN:
Category : Technology
Languages : en
Pages :
Book Description
This book chapter reports some spectacular and interesting 1D nanostructures of TiO2, which are grown by the anodic oxidation. Under suitable conditions, conventional one-step anodic oxidation is available to grow TiO2 nanotube arrays (TNAs) and TiO2 nanowires/nanotubes; meanwhile, two-step anodic oxidation allows fabricating some novel TNAs with spectacular morphologies such as highly ordered TNAs, bamboo-type TNAs, and lotus root-shaped TNAs. The formation mechanisms of these nanostructures during the anodic oxidation processes are elusive via studying effects of several key parameters such as oxidizing voltage, processing time, and electrolytes. In addition, the photocatalytic activity of the TNA-based nanomaterials is characterized by the degradation of pharmaceutical model, methylene blue, or the photoelectrochemical effect.
Photoelectrochemical Properties of "increasingly Dark" TiO2 Nanotube Arrays
Author: Nikita DenisovTiO2 Nanotube Arrays with Engineered Geometries
Author: Samira FarsinezhadPublisher:
ISBN:
Category : Nanotubes
Languages : en
Pages : 181
Book Description
Titanium dioxide (TiO2) is a wide band gap, robust, n-type semiconductor whose transformation into vertically-oriented nanotube arrays makes them suitable electron percolation pathways for vectorial charge transfer togerther with high surface area. Growth of self-organized TiO2 nanotube arrays as a membrane or on non-native substrates is critical for exploiting the full potential of this nanostructure in a variety of applications. Although regular TNAs on native substrates constitute one of the most potent semiconductors for a variety of applications, to date, less research has been conducted on engineering the geometry of such structures for photon management. In this dissertation, a fundamental investigation into TNA-based photon management by periodically modulated titanium dioxide nanotube arrays (PMTiNTs) and double layer TNAs on native substrates was carried out. The present work shows that bilayer film stacks consisting of nanotubes with small (~60 nm) and large (~200 nm) diameters, respectively improve the optical absorption. In the second part of this thesis, wherein the geometry of these unique nanostructures is engineered, galvanostatic pulse- generated modulation was used. The highly ordered PMTiNTs have been reported, which constitute bottom-up fabricated one-dimensional photonic crystals. As a last phase of the synthesis process, highly sophisticated vacuum deposition based techniques were used to investigate the influence of a variety of deposition rates and pressures at room temperataure on anodic nanotube growth formation on non-native substrates. In the third phase of the work, X-ray and ultraviolet photoelectron spectroscopic studies were used to investigate the interfacial band alignment for photocatalytic charge separation in TiO2 nanotube arrays coated with CuPt nanoparticles. In the last phase, low energy surfaces repellent to a wide spectrum of liquids by functionalizing TiO2 nanotubes arrays using monolayers of two different fluorinated hydrocarbon molecules were studied.
Black Tio2 Nanomaterials For Energy Applications
Author: Xiaobo ChenPublisher: World Scientific
ISBN: 1786341670
Category : Science
Languages : en
Pages : 330
Book Description
'This book not only provides a fundamental technical background on black TiO2 and the synthesis of this material, it also covers state-of-the-art applications and will provide the reader with current information on property behavior and show the direction of the latest research for this interesting material for energy applications.'IEEE Electrical Insulation MagazineThe transformation of titanium dioxide (TiO2) nanomaterials from white to black using disorder engineering has meant a dramatic increase in their performance in photocatalytic experiments. The efficiency with which black TiO2 nanomaterials can use sunlight to split water molecules for the production of hydrogen is significantly improved compared to using white crystals, and this pure hydrogen can then be used in batteries and fuels. The black TiO2 nanomaterials are also very promising in CO2 conversion, water treatment, and in air quality control.This book aims to present the recent progress on the research of black TiO2 nanomaterials, and how they can be used in a number of clean energy applications. The text covers a number of research topics, including the synthesis of black TiO2 nanomaterials (nanoparticles, nanowires and nanotubes) and their properties, the effect of point defects and ordered/disordered morphology, the applications in charge storage and photoelectrochemical water splitting, use in lithium ion batteries and in microwave absorption. Also included is a theoretical analysis of this research, thereby providing a comprehensive review of the subject for students, researchers and practitioners in catalytic science, materials science, nanotechnology, green technology, and chemistry.
Preparation of Highly-ordered TiO2 Nanotube Arrays and Their Applications in Dye-sensitized Solar Cells
Author: Yiqian ZhaoParametric Study on the Fabrication and Modification of Tio2 Nanotube Arrays for Photoeletrocatalytic Degradation of Organic Pollutants
Author: Hei-Lok TsaiPublisher:
ISBN: 9781360989921
Category :
Languages : en
Pages :
Book Description
This dissertation, "Parametric Study on the Fabrication and Modification of TiO2 Nanotube Arrays for Photoeletrocatalytic Degradation of Organic Pollutants" by Hei-lok, Tsai, 蔡希樂, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4516025 Subjects: Nanotubes Water - Purification - Photocatalysis
Author: 辛西亞