Surface Studies Of Metal Oxide Catalysts And Ultrathin Films
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Surface Studies Of Metal Oxide Catalysts And Ultrathin Films
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Author : David Charles Grinter
language : en
Publisher:
Release Date : 2011
Surface Studies Of Metal Oxide Catalysts And Ultrathin Films written by David Charles Grinter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Surface Studies Of Metal Oxide Catalysts And Ultrathin Films
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Author : D. C. Grinter
language : en
Publisher:
Release Date : 2011
Surface Studies Of Metal Oxide Catalysts And Ultrathin Films written by D. C. Grinter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
This thesis examines two important metal oxide systems: ultrathin CeO2(111) films on Pt(111), and carboxylic acids on TiO2 surfaces, both of which are significant for future energy research. The structure and growth of ultrathin films of CeO2(111) supported on Pt(111) have been studied with Scanning Tunnelling Microscopy (STM), Low Energy Electron Diffraction (LEED) and Auger Electron Spectroscopy (AES). The ultrathin films were grown in a number of ways and their growth mechanism, electronic structure, and domain boundaries were investigated using STM and STS. Atomically resolved STM images (filled and empty states) have been obtained on these ultrathin films permitting the identification of many defect structures. The behaviour of individual gold atoms at room temperature on ultrathin CeO2(111) films on Pt(111) has been investigated with STM. Simultaneous atomically resolved images of a gold adatom and the filled states of the ceria permitted the identification of two adsorption sites: (i) atop an oxygen atom and (ii) in a three-fold hollow site. The adsorption and reactivity of acetic acid on anatase TiO2(101) has also been investigated. It was found that at low coverage, acetic acid is observed to have a characteristic appearance consistent with a dissociative bidentate binding geometry to two neighbouring Ti5c sites. Deposition at elevated temperatures at saturation coverage yielded a (2 x 1) superstructure. The effects of heating, UV exposure, and tip pulsing were also investigated. STM has been used to investigate the adsorption and photo-reactivity of benzoic acid on rutile TiO2(110)(1 x 1) and (1 x 2). Benzoic acid binds to both surfaces dissociatively via a bridging geometry leading to a (2 x 1) overlayer on the (1 x 1) surface at saturation. Benzoate adsorbs between the added-rows of the (1 x 2) reconstruction leading to a (2 x 2) superstructure at higher coverage and demonstrated the important role of intermolecular interactions such as hydrogen bonding.
Oxide Ultrathin Films
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Author : Gianfranco Pacchioni
language : en
Publisher: John Wiley & Sons
Release Date : 2012-09-19
Oxide Ultrathin Films written by Gianfranco Pacchioni and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-19 with Technology & Engineering categories.
A wealth of information in one accessible book. Written by international experts from multidisciplinary fields, this in-depth exploration of oxide ultrathin films covers all aspects of these systems, starting with preparation and characterization, and going on to geometrical and electronic structure, as well as applications in current and future systems and devices. From the Contents: Synthesis and Preparation of Oxide Ultrathin Films Characterization Tools of Oxide Ultrathin Films Ordered Oxide Nanostructures on Metal Surfaces Unusual Properties of Oxides and Other Insulators in the Ultrathin Limit Silica and High-K Dielectrics Thin Films in Microelectronics Oxide Passive Films and Corrosion Protection Oxide Films as Catalytic Materials and as Models of Real Catalysts Oxide Films in Spintronics Oxide Ultrathin Films in Solid Oxide Fuel Cells Transparent Conducting and Chromogenic Oxide Films as Solar Energy Materials Oxide Ultrathin Films in Sensor Applications Ferroelectricity in Ultrathin Film Capacitors Titania Thin Films in Biocompatible Materials and Medical Implants Oxide Nanowires for New Chemical Sensor Devices
Surface Science Of Ultrathin Metal Oxide Films
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Author : J. Matharu
language : en
Publisher:
Release Date : 2011
Surface Science Of Ultrathin Metal Oxide Films written by J. Matharu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The properties of metal oxide surfaces are key to their diverse technological applications. However, the semiconducting nature of metal oxides presents a problem - many surface science techniques are electron based and thus require samples to be conducting. As such, bulk crystal studies of metal oxides by techniques such as photoemission spectroscopy (PES) and scanning tunneling microscopy (STM) are limited to reduced surfaces. Alternatively, thin films of a metal oxide can be synthesised on a suitable conducting substrate that mimic the bulk crystal surface whilst having sufficient conducting character to use these techniques. CeO2 is an important material found in three-way catalysts that remove pollutants from the exhaust gas of modern automobiles. Key to this application is the ability of reduced ceria to store and release oxygen depending on the composition of the exhaust. The addition of noble metals such as Pd to the ceria surface greatly improves the efficiency of pollutant conversion evidenced by X-ray photoelectron spectroscopy (XPS) by reducing the ceria. Resonance photoemission spectroscopy (RESPES) has been used to investigate the eect of Pd on ceria CeO2-x(110) thin films grown on a Pt(111) substrate. RESPES is more surface specific than XPS and thus reveals more information on the surface layers of ceria films. TiO2(110) is the most studied metal oxide surface, and has a multitude of applications. Its chemistry with two of the most abundant chemical species - water (H2O) and oxygen (O2) - is thus very important. H2O has been shown to dissociate on TiO2 surfaces. TiO2 thin films grown on W(100) were used as model system to study the chemistry of the reaction between TiO2 and H2O, and subsequently the reaction of hydrated surfaces with O2 using XPS. STM was used to examine the morphology of TiO2(110) films grown on W(100)-(2 x 1)-O, changes with film thickness and methods of improving surface smoothness. The first detailed STM images showing row structure of TiO2(110) films grown on W are shown.
Chemisorption And Reactivity On Supported Clusters And Thin Films
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Author : R.M. Lambert
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Chemisorption And Reactivity On Supported Clusters And Thin Films written by R.M. Lambert and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-17 with Science categories.
Heterogeneous catalysis provides the backbone of the world's chemical and oil industries. The innate complexity of practical catalytic systems suggests that useful progress should be achievable by investigating key aspects of catalysis by experimental studies on idealised model systems. Thin films and supported clusters are two promising types of model system that can be used for this purpose, since they mimic important aspects of the properties of practical dispersed catalysts. Similarly, appropriate theoretical studies of chemisorption and surface reaction clusters or extended slab systems can provide valuable information on the factors that underlie bonding and catalytic activity. This volume describes such experimental and theoretical approaches to the surface chemistry and catalytic behaviour of metals, metal oxides and metal/metal oxide systems. An introduction to the principles and main themes of heterogeneous catalysis is followed by detailed accounts of the application of modern experimental and theoretical techniques to fundamental problems. The application of advanced experimental methods is complemented by a full description of theoretical procedures, including Hartree-Fock, density functional and similar techniques. The relative merits of the various approaches are considered and directions for future progress are indicated.
The Surface Science Of Metal Oxides
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Author : Victor E. Henrich
language : en
Publisher: Cambridge University Press
Release Date : 1994
The Surface Science Of Metal Oxides written by Victor E. Henrich and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Science categories.
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Oxide Thin Films And Nanostructures
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Author : Falko P. Netzer
language : en
Publisher: Oxford University Press
Release Date : 2021-02-25
Oxide Thin Films And Nanostructures written by Falko P. Netzer and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-25 with Science categories.
Nanostructured oxide materials - ultra-thin films, nanoparticles and other nanometer-scale objects - play prominent roles in many aspects of our every-day life, in nature and in technological applications, among which is the all-oxide electronics of tomorrow. Due to their reduced dimensions and dimensionality, they strongly interact with their environment: gaseous atmosphere, water or support. Their novel physical and chemical properties are the subject of this book, from both a fundamental and an applied perspective. Oxide Thin Films and Nanostructures reviews and illustrates the various methodologies for their growth, fabrication, experimental and theoretical characterization. The role of key parameters such as film thickness, nanoparticle size and support interactions in driving their fundamental properties is underlined. At the ultimate thickness limit, two-dimensional oxide materials are generated, whose functionalities and potential applications are described. The emerging field of cation mixing is mentioned, which opens new avenues for engineering many oxide properties, as witnessed by natural oxide nanomaterials such as clay minerals, which, beyond their role at the Earth's surface, are now widely used in a whole range of human activities. Oxide nanomaterials are involved in many interdisciplinary fields of advanced nanotechnologies. Catalysis, photocatalysis, solar energy materials, fuel cells, corrosion protection, and biotechnological applications are amongst the areas where they are making an impact. The book outlines prototypical examples. A cautious glimpse into future developments of scientific activity is finally ventured to round off the presentation.
Ultrathin Oxide Layers For Solar And Electrocatalytic Systems
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Author : Heinz Frei
language : en
Publisher: Royal Society of Chemistry
Release Date : 2022-01-04
Ultrathin Oxide Layers For Solar And Electrocatalytic Systems written by Heinz Frei and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-04 with Technology & Engineering categories.
Ultrathin metal oxide layers have emerged in recent years as a powerful approach for substantially enhancing the performance of photo, electro, or thermal catalytic systems for energy, in some cases even enabling the use of highly attractive materials previously found unsuitable. This development is due to the confluence of new synthetic preparation methods for ultrathin oxide layers and a more advanced understanding of interfacial phenomena on the nano and atomic scale. This book brings together the fundamentals and applications of ultrathin oxide layers while highlighting connections and future opportunities with the intent of accelerating the use of these materials and techniques for new and emerging applications of catalysis for energy. It comprehensively covers the state-of-the-art synthetic methods of ultrathin oxide layers, their structural and functional characterization, and the broad range of applications in the field of catalysis for energy. Edited by leaders in the field, and with contributions from global experts, this title will be of interest to graduate students and researchers across materials science and chemistry who are interested in ultrathin oxide layers and their applications in solar energy conversion, renewable energy, photocatalysis, electrocatalysis and protective coatings.
Growth And Properties Of Ultrathin Epitaxial Layers
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Author :
language : en
Publisher: Elsevier
Release Date : 1997-06-18
Growth And Properties Of Ultrathin Epitaxial Layers written by and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-06-18 with Science categories.
Although there has been steady progress in understanding aspects of epitaxial growth throughout the last 30 years of modern surface science, work in this area has intensified greatly in the last 5 years. A number of factors have contributed to this expansion. One has been the general trend in surface science to tackle problems of increasing complexity as confidence is gained in the methodology, so for example, the role of oxide/metal interfaces in determining the properties of many practical supported catalysts is now being explored in greater detail. A second factor is the recognition of the potential importance of artificial multilayer materials not only in semiconductor devices but also in metal/metal systems because of their novel magnetic properties. Perhaps even more important than either of these application areas, however, is the newly-discovered power of scanning probe microscopies, and most notably scanning tunneling microscopy (STM), to provide the means to study epitaxial growth phenomena on an atomic scale under a wide range of conditions. These techniques have also contributed to revitalised interest in methods of fabricating and exploiting artificial structures (lateral as well as in layers) on a nanometre scale. This volume, on Growth and Properties of Ultrathin Epitaxial Layers, includes a collection of articles which reflects the present state of activity in this field. The emphasis is on metals and oxides rather than semiconductors.
Surface Studies Of A Metal Oxide Catalyst
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Author : Adam J. Roberts
language : en
Publisher:
Release Date : 1995
Surface Studies Of A Metal Oxide Catalyst written by Adam J. Roberts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.