Download or read book Electric Field Assisted Chemical Vapour Deposition Processes on Titanium Dioxide Thin Films for Photocatalysis written by Luz Romero and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASSESSMENT OF PHOTOCATALYTIC PERFORMANCE OF ALUMINUM SUPPORTED TITANIUM DIOXIDE THIN FILMS PRODUCED BY FLAME ASSISTED CHEMICAL VAPOUR DEPOSITION written by ERIC E. POTTER and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerosol Assisted Chemical Vapour Deposition of Doped Titania Films Characterisation and Functional Properties written by Abdullah Mohmmed Alotaibi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) is the leading material for self-cleaning applications due to its unique propertiesAÌ‚ ̧ including the fact that it exhibits high photocatalysis, mechanical robustness, chemical inertness, low cost, environmentally friendliness and abundance. The bandgap of TiO2 is relatively large, and this limits its outdoor applications. Another obstacle for its use as a photocatalyst is the high level of electron"â€hole recombination and low rate of photoreaction with reactants. There have been great efforts to improve the photocatalytic properties of TiO2. These have involved searching for ways of decreasing the bandgap structure and recombination rate, as well as improving the electronic structure to enhance its functional properties under visible light. One useful approach for achieving a suitable bandgap and improving electron"â€hole separation is combining or doping TiO2 with anionic and/or cationic species. In this study, Cu-doped TiO2 films were deposited via aerosol-assisted chemical vapour deposition (AACVD). The Cu-doped TiO2 films system in both phases (anatase and rutile) were specifically investigated for improved photocatalytic and antimicrobial properties of TiO2 under UVA compared with pure TiO2 thin films. Interactions between substitutional (replacing oxygen sites) and interstitial (sitting in the TiO2 lattice) Cu in the anatase lattice may also explain the enhancement in exciton lifetimes. A range of copper concentrations (2, 5, 10 and 20%) was investigated so that the photocatalytic and antibacterial abilities (vs. S. aureus and E. coli) could be determined. Effective dopant selection and concentration control is key to providing the maximum efficiency in terms of carrier lifetimes for migration to the surface for the necessary reactions to take place in photocatalysis and antibacterial activity. Interestingly, the AACVD system could be used to deposit TiO2 in rutile form on a thin layer of ZrO2 at 500°C. Cu-doped rutile"â€TiO2 films using a range of copper concentrations (2, 5, 10 and 20%) were investigated as well. The films showed surface plasmon resonance (SPR). In addition, these films exhibited enhanced photocatalytic activity under visible light irradiation, which could have been due to SPR. To the best of our knowledge, this is the first time that the brookite thin film form has been deposited by AACVD; in using AACVD to deposit the brookite TiO2 thin films, the band structure and photocatalytic properties were investigated. The brookite films grown by AACVD showed a direct bandgap of 3.4 eV. It was found that the photocatalytic properties of the brookite form, in comparison with degradation of stearic acid, were greater than the activity of anatase TiO2 thin films, as well as active glass. In addition, transient absorption spectroscopy (TAS) measurements showed that the hole"â€electron recombination dynamics are similar in both phases. The high surface area of the brookite form compared with the surface area of the anatase thin film could be the primary reason for the super-photocatalytic properties. Surprisingly, the brookite film exhibited superhydrophilic properties prior to any irradiation. The addition of Zn and nitrogen into the matrix of TiO2 films by AACVD was studied most extensively to improve the functional properties of TiO2 and achieve its activity under visible light. The oxygen atom in TiO2 lattice can be replaced by a nitrogen atom, which is called Ns (substitutional doping) in this case; alternatively, nitrogen atoms can be set in the TiO2 lattice, and this is called Ni (interstitial doping). These approaches create NHX and NOX surface species, which were observed using the X-ray photoelectron spectroscopy (XPS) results in this research. Transient absorption spectroscopy (TAS) was used to investigate the addition of (N + Zn) on the charge carrier dynamics of TiO2. Heterojunction systems of semiconductor materials are employed in different applications, such as water splitting, catalysis and electronic devices. These systems strengthen the synergistic effect, electron tunnelling and electron transfer, thereby leading to improved performance compared with the individual components. By using AACVD and APCVD processes with heterojunction systems, TiO2/Fe2O3 films were deposited, and different thicknesses of TiO2 were used on the Fe2O3 films. The resulting TiO2/Fe2O3 films exhibited enhanced performance in terms of the photocatalytic properties for the degradation of stearic acid under white light, as well as better photocurrent density and stability of the TiO2/α-Fe2O3 heterojunction. The TAS measurements showed the extent of its lifetime photogenerated charges.

Download or read book Ultrahigh Vacuum Metalorganic Chemical Vapor Deposition and in Situ Characterization of Nanoscale Titanium Dioxide Films written by Polly Wanda Chu and published by . This book was released on 1994 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin titanium dioxide films were produced by metalorganic chemical vapor deposition on sapphire(0001) in an ultrahigh vacuum (UHV) chamber. A method was developed for producing controlled submonolayer depositions from titanium isopropoxide precursor. Film thickness ranged from 0.1 to 2.7 nm. In situ X-ray photoelectron spectroscopy (XPS) was used to determine film stoichiometry with increasing thickness. The effect of isothermal annealing on desorption was evaluated. Photoelectron peak shapes and positions from the initial monolayers were analyzed for evidence of interface reaction. Deposition from titanium isopropoxide is divided into two regimes: depositions below and above the pyrolysis temperature. This temperature was determined to be 300 deg C. Controlled submonolayers of titanium oxide were produced by cycles of dosing with titanium isopropoxide vapor below and annealing above 300 deg C. Precursor adsorption below the pyrolysis temperature was observed to saturate after 15 minutes of dosing. The quantity absorbed was shown to have an upper limit of one monolayer. The stoichiometry of thin films grown by the cycling method were determined to be TiO2. Titanium dioxide film stoichiometry was unaffected by isothermal annealing at 700 deg C. Annealing produced a decrease in film thickness. This was explained as due to desorption. Desorption ceased at approximately 2.5 to 3 monolayers, suggesting bonding of the initial monolayers of film to sapphire is stronger than to itself. Evidence of sapphire reduction at the interface by the depositions was not observed. The XPS O is peak shifted with increased film thickness. The shifts were consistent with oxygen in sapphire and titanium dioxide having different O is photoelectron peak positions. Simulations showed the total shifts for thin films ranging in thickness of 0.1 to 2.7 nm to be -0.99 to -1.23 eV. Thick films were produced for comparison.

Download or read book Aerosol Assisted Chemical Vapour Deposition of Titanium Dioxide and Tungsten Oxide Thin Films written by and published by . This book was released on 2014 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Titanium Dioxide Photocatalysis written by Vladimiro Dal Santo and published by MDPI. This book was released on 2019-05-27 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the seminal work of Fujishima et al. dates back to 1971, TiO2 still remains the most diffused and studied semiconductor, employed in photo-oxidation processes for cleantech (i.e., polluted water and air treatment), in solar fuel production (mainly hydrogen production by water photo splitting), and in Carbon Capture and Utilization (CCU) processes by CO2 photoreduction. The eleven articles, among them three reviews, in this book cover recent results and research trends of various aspects of titanium dioxide photocatalysis, with the chief aim of improving the final efficiency of TiO2-based materials. Strategies include doping, metal co-catalyst deposition, and the realization of composites with plasmonic materials, other semiconductors, and graphene. Photocatalysts with high efficiency and selectivity can be also obtained by controlling the precise crystal shape (and homogeneous size) and the organization in superstructures from ultrathin films to hierarchical nanostructures. Finally, the theoretical modeling of TiO2 nanoparticles is discussed and highlighted. The range of topics addressed in this book will stimulate the reader’s interest as well as provide a valuable source of information for researchers in academia and industry.

Download or read book Chemical Vapor Deposition and Characterization of Titanium Dioxide Thin Films written by David Christopher Gilmer and published by . This book was released on 1998 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Self Cleaning Surfaces and Materials written by Akira Fujishima and published by John Wiley & Sons. This book was released on 2023-05-03 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Self-Cleaning Surfaces and Materials The first truly comprehensive work on this rapidly developing field in two volumes Self-cleaning surfaces are those that can be cleaned, for instance, by sun or rainwater, without human intervention. They are sometimes found in nature but developing man-made equivalents has been a major area of nanotechnology research in recent years. Self-cleaning tiles, glasses, paints, and textiles have been developed to date, and the number of applications for this technology is growing. Handbook of Self-Cleaning Surfaces and Materials provides a comprehensive overview of this field of study. It includes two volumes, with the first presenting the basic principles of the field and the second supplying specific examples and applications. It is a one-stop shop for anyone looking to familiarize themselves with this area of technological research, as well as for existing professionals who want a handy and thorough reference. Readers of the Handbook of Self-Cleaning Surfaces and Materials will also find: An editor and contributor team with decades of experience in both academic and industrial research Detailed treatment of subjects including TiO2 photocatalysis, hydrophobic self-cleaning surfaces, and more Figures throughout illustrating important concepts and chemical formulas Handbook of Self-Cleaning Surfaces and Materials is an essential resource for researchers and industry professionals in chemistry, surface physics, and materials science.

Download or read book Titanium Dioxide written by Dongfang Yang and published by BoD – Books on Demand. This book was released on 2018-06-27 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide is currently being used in many industrial products. It provides unique photocatalytic properties for water splitting and purification, bacterial inactivation, and organics degradation. It has also been widely used as the photoanode for dye-sensitized solar cells and coatings for self-cleaning surfaces, biomedical implants, and nanomedicine. This book covers various aspects of titanium dioxide nanomaterials including their unique one-dimensional, two-dimensional, mesoporous, and hierarchical nanostructures and their synthetic methods such as sol-gel, hydrothermal, anodic oxidation, and electrophoretic deposition, as well as its key applications in environmental and energy sectors. Through these 24 chapters written by experts from the international scientific community, readers will have access to a comprehensive overview of the recent research and development findings on the titanium dioxide nanomaterials.

Download or read book Nanostructured Titanium Dioxide in Photocatalysis written by It-Meng Low and published by CRC Press. This book was released on 2021-06-18 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium dioxide (TiO2) has drawn considerable attention as an attractive inorganic raw material for various applications due to its inexpensiveness, nontoxic nature, stability, and excellent photocatalytic activity. Photocatalysis is one of the most promising route for sustainable chemistry of the 21st century. It can contribute to solving environmental, global energy, and chemical problems, as well as to the sustainable production of commodities in the near future. This book presents the fundamentals of photocatalysis in nanostructured TiO2 and describes the factors affecting the photocatalytic activity, design, and synthesis of various forms of nanostructured TiO2. It highlights the use of ion-doping and inert-atmosphere annealing to extend the light-absorption range of photocatalysts and reduce recombination between electrons and holes. It discusses numerous applications in the fields of energy and environment, such as water purification, gas sensing, storage and delivery, and energy generation. The book is an invaluable resource and useful guide for a broad readership in various fields of catalysis, materials science, environment, and energy.

Download or read book Principles of Vapor Deposition of Thin Films written by Professor K.S. K.S Sree Harsha and published by Elsevier. This book was released on 2005-12-16 with total page 1173 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of producing devices that are smaller, faster, more functional, reproducible, reliable and economical has given thin film processing a unique role in technology. Principles of Vapor Deposition of Thin Films brings in to one place a diverse amount of scientific background that is considered essential to become knowledgeable in thin film depostition techniques. Its ultimate goal as a reference is to provide the foundation upon which thin film science and technological innovation are possible. * Offers detailed derivation of important formulae. * Thoroughly covers the basic principles of materials science that are important to any thin film preparation. * Careful attention to terminologies, concepts and definitions, as well as abundance of illustrations offer clear support for the text.

Download or read book Aerosol Assisted Chemical Vapour Deposition of Titanium Dioxide and Tungsten Oxide Thin Films written by Cynthia Edusi and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magneto Luminous Chemical Vapor Deposition written by Hirotsugu Yasuda and published by CRC Press. This book was released on 2011-04-04 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The magneto luminous chemical vapor deposition (MLCVD) method is the perfect example of the "front-end green process." It employs an entirely new process that expends the minimum amount of materials in gas phase, yields virtually no effluent, and therefore requires no environmental remediation. Unlike the "back-end green process," which calls for a

Download or read book Low Pressure Metal Organic Chemical Vapor Deposition of Titanium Dioxide Thin Films in Conjunction with Photocatalytic Investigations written by Abon Jason Manuel del Rosario and published by . This book was released on 2003 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Thin Film Deposition Techniques Principles Methods Equipment and Applications Second Editon written by Krishna Seshan and published by CRC Press. This book was released on 2002-02-01 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Thin Film Deposition Techniques: Principles, Methods, Equipment and Applications, Second Edition explores the technology behind the spectacular growth in the silicon semiconductor industry and the continued trend in miniaturization over the last 20 years. This growth has been fueled in large part by improved thin film deposition tec

Download or read book Selective Light Induced Chemical Vapour Deposition of Titanium Dioxide Thin Films written by Estelle Wagner and published by . This book was released on 2003 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Deposition Technologies for Films and Coatings written by Rointan Framroze Bunshah and published by Cambridge University Press. This book was released on 1994 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition, edited by the world-renowned Dr. Rointain Bunshah, is an extensive update of the many improvements in deposition technologies, mechanisms, and applications. Considerably more material was added in Plasma Assisted Vapor Deposition processes, as well as Metallurgical Coating Applications.