Download or read book A Study of the Interactions of Polar Organic Molecules with Metal and Metal Oxide Surfaces written by Anthony Vincent Fraioli and published by . This book was released on 1956 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Molecule Surface Interactions on Metal Oxides written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interactions of vibrationally excited HCI(v =2) with MgO(100) surfaces have been examined in detail, with scattered HCI(v =2) detected state selectively by resonance enhanced multiphoton ionization (REMPI). Simulations using a random walk model and 'best estimates' for activation energies for desorption and hopping suggest that deactivation probably occurs at steps. In parallel, a new apparatus has been designed and built for a next generation of studies of molecular interactions on insulating oxide surfaces. Specifically, FTIR will be used to determine geometries and adsorption, and TPD, REMPI and other laser-based spectroscopies will be used to interrogate interactions of molecules and radicals with the surface and with other adsorbates.
Download or read book Organic Molecules on Metal and Oxide Semiconductor Substrates written by Charles M. Ruggieri and published by . This book was released on 2016 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern devices such as organic light emitting diodes use organic/oxide and organic/metal interfaces for crucial processes such as charge injection and charge transfer. Understanding fundamental physical processes occurring at these interfaces is essential to improving device performance. The ultimate goal of studying such interfaces is to form a predictive model of interfacial interactions, which has not yet been established. To this end, this thesis focuses on obtaining a better understanding of fundamental physical interactions governing molecular self-assembly and electronic energy level alignment at organic/metal and organic/oxide interfaces. This is accomplished by investigating both the molecular adsorption geometry using scanning tunneling microscopy, as well as the electronic structure at the interface using direct and inverse photoemission spectroscopy, and analyzing the results in the context of first principles electronic structure calculations. First, we study the adsorption geometry of zinc tetraphenylporphyrin (ZnTPP) molecules on three noble metal surfaces: Au(111), Ag(111), and Ag(100). These surfaces were chosen to systematically compare the molecular self-assembly and adsorption behavior on two metals of the same surface symmetry and two surface symmetries of one metal. From this investigation, we improve the understanding of self-assembly at organic/metal interfaces and the relative strengths of competing intermolecular and molecule-substrate interactions that influence molecular adsorption geometry. We then investigate the electronic structure of the ZnTPP/Au(111), Ag(111), and Ag(100) interfaces as examples of weakly-interacting systems. We compare these cases to ZnTPP on TiO2(110), a wide-bandgap oxide semiconductor, and explain the intermolecular and molecule-substrate interactions that determine the electronic energy level alignment at the interface. Finally we study tetracyanoquinodimethane (TCNQ), a strong electron acceptor, on TiO2(110), which exhibits chemical hybridization accompanied by molecular distortion, as well as extreme charge transfer resulting in the development of a space charge layer in the oxide. Thus, we present a broad experimental and theoretical perspective on the study of organic/metal and organic/oxide interfaces, elucidating fundamental physical interactions that govern molecular organization and energy level alignment.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2001 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Surface Science of Metal Oxides written by Victor E. Henrich and published by . This book was released on 1994 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to give a comprehensive account of the fundamental properties of metal-oxide surfaces.
Download or read book Dissertation Abstracts written by and published by . This book was released on 1958 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Master s Theses and Doctoral Dissertations in the Pure and Applied Sciences written by and published by . This book was released on 1958 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1956 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States written by and published by . This book was released on 1959 with total page 528 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 1970 with total page 1776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AEC Euratom Conference on Aqueous Corrosion of Reactor Materials written by and published by . This book was released on 1960 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymeric and Self Assembled Hydrogels written by Xian Jun Loh and published by Royal Society of Chemistry. This book was released on 2013 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only book to give a complete picture of current hydrogel research, covering all the major applications as well as the fundamental principles behind them.
Download or read book TID written by and published by . This book was released on 1960 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index 1861 1972 Chemistry written by Xerox University Microfilms and published by . This book was released on 1973 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction of Metal and Oxide Surfaces with Thin Films of Polar Phthalocyanines written by Małgorzata Polek and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first part of this thesis, interface properties of polar phthalocyanines (Pc's): chloroaluminum(III) phthalocyanine (AlClPc) and fluoroaluminum(III) phthalocyanine (AlFPc) are investigated in form of thin films deposited on two types of silver surfaces: a single crystal and a foil. The samples were analyzed with X-ray and ultraviolet photoemission spectroscopy (XPS and UPS). A strong interaction between the organic material and silver surface has been found, which is independent of silver substrate type used. The molecules undergo a loss of their central atom ligand, with the molecule ring staying intact. After de-attachment, the central atom ligand forms a bond with silver surface leading to the formation of Ag-Cl and Ag-F bonds on the surface of silver. What is more, roughness of the substrate surface influences the interface properties. An additional intensity is formed close to the Fermi edge for monolayer thick films. It is present only on substrates with high roughness and is an indication of gap states formation. In the second part of thesis, interface properties of chloroaluminum(III) phthalocyanine (AlClPc) at the interface to two rutile titanium dioxide single crystal surfaces: (001) and (100) surface, have been studied with XPS and UPS. Additionally, the substrates were characterized with low energy electron diffraction (LEED) to provide information on surface structure and reconstruction. A strong interaction has been found between nitrogen atoms of phthalocyanine ring and titanium dioxide surface. The interaction is stronger on the (001) surface than the (100) surface due to their different surface structure, leading to the lower reactivity of the latter one. The reactivity can be varied with number of defects in the crystal structure. The interaction was found to depend on the amount of defects present. As a consequence, using oxygen during preparation steps decreases the amount of defects and allows to quench the interaction. Furthermore, investigation of film growth on TiO2 substrates was performed using mainly microscopy methods: atomic force microscopy and scanning electron microscopy (AFM, SEM). Decrease of substrate signal intensity observed in XPS provided complementary information on film growth. It has been found that the surface type has a strong influence on the AlClPc growth mode since the organic films have a layer-island growth on the (001) surface and possible island-only growth on the (100) surface. Introduction of defects influences the film morphology since the islands are more dense and smaller in size on oxygen treated (“defect-free”) surface, while the island distribution on a reduced (defect-rich) (100) surface is scarce, and the islands are bigger in size. Based on the results of experiments presented in this thesis, it was found that the interaction of phthalocyanines can be controlled with the substrate surface type: although charge transfer from the molecule to the substrate is observed on both surfaces, the interaction with silver influences the phthalocyanine center, while interaction with titanium dioxide influences the phthalocyanine ring. Additionally, the reactivity of phthalocyanine molecules towards the titanium dioxide single crystals is dependent on the amount of defects present, thus can be controlled through adjustment of sample preparation conditions. The type and preparation of TiO2 surface has influence on film growth mode as well.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
