Download or read book Preparation and Characterization of Sol gel Derived Peroxo Titania and Its Application for Nano crystalline Dye Sensitized Solar Cell written by Young Jun Hong and published by . This book was released on 2002 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preparation and Characterization of Stable Macroporous Titania Nano wells written by Hema Santhi Aluri and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Silica based sol-gel thin films have been extensively studied because of their advantages that include optical transparency, high biodegradability and low intrinsic fluorescence. However, one concern with silica based sol-gel derived materials is their long term stability in aqueous solutions. Another concern is their limited porosity. These two concerns limit the application of these materials in catalysis and separations. The main objective of this study is to prepare porous, thin films using titanium alkoxides as precursors and evaluate their long term stability in aqueous solutions. Colloidal crystal templating will be used to introduce macrosized pores into the titania network. The materials will be characterized using SEM and AFM. To prove that the templated films provide access to the underlying surface of the electrode, a conducting metal like copper was electrodeposited inside the nano-wells. The stability of titania and silica films will be evaluated over a two month period using cyclic voltammetry with three redox probes.
Download or read book Structuring and filling of titania films for applications in photovoltaics written by Monika Rawolle and published by Cuvillier Verlag. This book was released on 2013-04-02 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kurzbeschreibung Die Möglichkeiten, Titandioxid Nanostrukturen zu synthetisieren, sowie die erhaltenen Strukturen rückzubefüllen, werden mit Hinblick auf Anwendungen in der Photovoltaik in der vorliegenden Arbeit untersucht. Auf Titandioxid basierende Solarzellen werden in Hybridsolarzellen und in Farbstoffsolarzellen unterteilt. Das Hauptaugenmerk der Untersuchungen liegt auf der Korrelation zwischen Morphologie und Funktion der resultierenden Strukturen. Die verschiedenen untersuchten Systeme und die damit verbundenen Fragestellungen umfassen zum einen die Strukturierung von Titandioxid und zum anderen das Rückbefüllen dieser Strukturen. Die Synthese von Titandioxid wird mittels Sol-Gel Chemie vorgenommen. Die Strukturen werden in der Synthese durch Blockcopolymertemplate vorgegeben. Die damit hergestellten dünnen Filme von Titandioxid zeigen eine hohe Porosität, mit einer Schwammartigen Morphologie die sowohl Mesoporen als auch Makroporen aufweist. Die Strukturen werden in dünnen Filmen und in einem nanostrukturierten Tropfen untersucht. Eine Verbesserung der Strukturen durch die Kombination der Sol-Gel Synthese mit Mikrofluidik wird ebenfalls diskutiert. Zudem wird eine mögliche Syntheseroute bei niedrigen Temperaturen vorgestellt, die es erlaubt kristallines Titandioxid zu erhalten. Die Stabilität der Strukturen gegen die Kapillarkräfte bei der Infiltrierung von Wasserdampf wird getestet. Um funktionierende Solarzellen zu erhalten, müssen die Titandioxidnanostrukturen mit einem lochleitenden Material gefüllt werden. Der Grad der Rückbefüllung mit lochleitenden Materialien korreliert mit der Funktion in Solarzellen. Description In the presented thesis, the possibilities to synthesize titania nanostructures and the possibilities to fill the resulting nanostructures by other materials are investigated for photovoltaic applications. The solar cells based on titania are distinguished either as hybrid or as dye-sensitized solar cells. The main focus of the investigations lies on the correlation of the morphology and the functionality of the obtained thin films. The different investigated systems and related questions comprise the structuring of titania on the one hand, and the filling of the structures on the other hand. Sol-gel chemistry in combination with block copolymers as structure templates is applied to obtain titania thin films with a sponge-like morphology, which shows a high porosity and both mesopores and macropores. The structures are investigated in thin films, but also in a nanostructured drop of titania. Improvement of the structures by the combination of micro-fluidics with the templated sol-gel is also discussed. Furthermore, a low temperature synthesis route is examined to obtain crystalline titania. The stability of the resulting titania films is checked for water vapor infiltration with the resulting capillary forces. In order to obtain working solar cells, the titania nanostructures need to be filled by hole-conducting materials. The degree of filling of the structures with hole-conducting organic materials is related to the functionality of the solar cells.
Download or read book Preparation Characterization and Application of Porous Titania by Sol gel Method written by Muhammed Yusuf Miah and published by . This book was released on 2002 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sol gel Derived Silver Doped Nanocrystalline Titania Catalysed Photodegradation of Methylene Blue from Aqueous Solution written by Nur Amirah Azhar and published by . This book was released on 2012 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sol gel Processing and Characterization of Macroporous Titania Coatings written by Young-Joo Kim and published by . This book was released on 1995 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Characterization and Photoconductivity Behavior of Inverted Nanocrystalline Titania and Nanocrystalline Titania silica Photonic Crystals written by Hourieh Exir and published by . This book was released on 2006 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bottom-up template-directed synthesis approach, using a modified sol-gel process was used, to synthesize inverted nanocrystalline titania opal (i-ncTiO2-o) and nanocrystalline titania-silica opal (ncTiO 2/SiO2-o) on a substrate. Scanning electron microscopy and optical spectroscopy confirmed the high structural and optical quality of the i-ncTiO2-o and ncTiO2/SiO2-o films. The crystalline phase and size of the crystallites of the i-ncTiO2-o and ncTiO2/SiO2-o films were obtained from wide-angle X-ray Diffraction to be anatase in the range between 15 to 30 nm. Optical spectroscopy was used to investigate the effect of water on the optical characteristics of the i-ncTiO2-o and ncTiO2/SiO 2-o films. The photoconductivity behavior of the i-ncTiO2-o and ncTiO2/SiO2-o films in the range between 300 to 450 nm at the higher energy flat bands was investigated and compared with those of nanocrystalline titania (nc-TiO2) reference films.
Download or read book Hydrothermal Growth and Characterization of Titanium Dioxide Nanostructures for Use in Dye Sensitized Solar Cells written by Judith D. Sorge and published by . This book was released on 2009 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the world's energy needs continue to grow, next generation photovoltaic cells are in high demand because they offer the possibility of an inexpensive alternative to current energy production techniques. Dye sensitized solar cells (DSSC's), utilize common materials and low cost commercialization techniques, which make them a compelling choice for research in this area. This research focuses on the titanium dioxide coating, which transfers electrons from the photoactive dye to the electrode. 3-4% efficient DSSC's using doctor bladed titanium dioxide coatings with a specific surface area of 55-60m2/g have been demonstrated in our laboratory. To enhance the efficiency of these cells, both the surface area and the electron conduction of the titania layer must be optimized. This has been done by utilizing high aspect ratio nanoparticles of titania instead of mesoporous layers formed with spherical particles. Anodization of titanium metal or anodic alumina membrane templating are common ways to produce nanorods, but involve complex processes leading toward expensive commercialization. This research instead focuses on the hydrothermal growth of nanofibrous titania on a titanium metal substrate, removing the need for dispersion and deposition procedures as well as using a low temperature processing method. Depending upon the formulation utilized, a variety of structures can be produced, from thick carpets of nanofiber strands to large platelets. The composition and morphology of the products have been characterized with respect to the growth conditions using electron microscopy, energy dispersive spectroscopy and x-ray diffraction. The compositional analysis is used to investigate the complicated reaction mechanisms in the system. Coatings of titania nanotubes were then tested in the DSSC's, as were those with the titanium metal substrate acting as the photo anode. Modeling the geometric parameters of the different pore structures of the coatings helps us to understand the advantages afforded by these new cells.
Download or read book Aqueous Sol Gel Derived Titania and Modified Titania for Biomedical Applications written by Francis James Allison and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Porous Titanium Dioxide Nanomaterials for Photocatalytic and Photovoltaic Applications written by Yan Li and published by . This book was released on 2016 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TiO2 Nanoparticles written by Aiguo Wu and published by John Wiley & Sons. This book was released on 2020-06-02 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unique book that summarizes the properties, toxicology, and biomedical applications of TiO2-based nanoparticles Nanotechnology is becoming increasingly important for products used in our daily lives. Nanometer-sized titanium dioxide (TiO2) are widely used in industry for different purposes, such as painting, sunscreen, printing, cosmetics, biomedicine, and so on. This book summarizes the advances of TiO2 based nanobiotechnology and nanomedicine, covering materials properties, toxicological research, and biomedical application, such as antibacter, biosensing, and cancer theranostics. It uniquely integrates the TiO2 applications from physical properties, toxicology to various biomedical applications, and includes black TiO2 based cancer theranostics. Beginning with a comprehensive introduction to the properties and applications of nanoparticles, TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine offers chapters on: Toxicity of TiO2 Nanoparticles; Antibacterial Applications of TiO2 Nanoparticles; Surface Enhanced Raman Spectrum of TiO2 Nanoparticle for Biosensing (TiO2 Nanoparticle Served as SERS Sensing Substrate); TiO2 as Inorganic Photosensitizer for Photodynamic Therapy; Cancer Theranostics of Black TiO2 Nanoparticles; and Neurodegenerative Disease Diagnostics and Therapy of TiO2-Based Nanoparticles. This title: -Blends the physical properties, toxicology of TiO2 nanoparticles to the many biomedical applications -Includes black TiO2 based cancer theranostics in its coverage -Appeals to a broad audience of researchers in academia and industry working on nanomaterials-based biosensing, drug delivery, nanomedicine TiO2 Nanoparticles: Applications in Nanobiotechnology, Theranostics and Nanomedicine is an ideal book for medicinal chemists, analytical chemists, biochemists, materials scientists, toxicologists, and those in the pharmaceutical industry.
Download or read book Preparation and Characterization of Titanium Dioxide Terbium Doped Via Sol Gel Method written by Nurrulhidayah Ahmad Fadzlillah and published by . This book was released on 2007 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of TiO2 Nanocrystals written by 彭嘉德 and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Novel Preparation of Nanostructured Titanium Dioxide Photocatalytic Particles Films Membranes and Devices for Environmental Applications written by Hyeok Choi and published by . This book was released on 2007 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: From a scientific point of view, this study will provide new nanotechnological and materials chemistry procedures to synthesize highly efficient photocatalytic TiO2 particles, films, and membranes that can be used for the treatment and disinfection of water and wastewater under even visible light irradiation, and highly sensitive TiO2-based devices for the development of new type of sensors.
Download or read book On the Chemistry and Morphology of Titania Aerogels Derived from Sol gel Processing written by Fang Meng and published by . This book was released on 1998 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shape Control of Highly Crystallized Titania Nanorods for Dye Sensitized Solar Cells Based on Formation Mechanism written by Motonari Adachi and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape Control of Highly Crystallized Titania Nanorods for Dye-Sensitized Solar Cells Based on Formation Mechanism.
