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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Cu(111)"”.
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Photoemission Studies of Thin Metallic Overlayer Systems
… photoemission spectroscopy was used to study Ag(111) monolayers on six different substrates: Ni(001), Ni(111), Cu(001), Cu(111), Au(111), and Si(111)-(7x7). The properties of surface states were also examined for several related systems: Cu(111) covered by various thicknesses of Ag, and a bare …
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Copper Electrode Surfaces: Electrodeposition and Oxide Formation
… forces between a Si3N 4 cantilever and a Cu(111) surface were used to probe the oxidation and reduction of this material in basic solution. The results showed the potential-dependent formation of insoluble and soluble copper oxide species at or near Cu(111) surface.
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Ultrahigh vacuum studies of the boundary lubrication of metals
A novel ultrahigh vacuum (UHV) tribometer was used to study the tribological behavior of two Cu(111) surfaces modified by the adsorption of various atomic (sulfur, chlorine, iodine) and molecular (ethanol, trifluoroethanol, butanol, and heptafluorobutanol) species as a function of coverage. The …
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Multi-Photon Spectroscopic Studies of Molecule/Metal Interfaces and Graphene
… multi-photon spectroscopic studies on molecule/metal interfaces and graphene. Two different aspects of these ultrathin molecular or atomic materials were investigated: (1) the electronic structure of molecule/metal interfaces and (2) nonlinear optical properties of graphene. For the case …
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Diffusion of light adsorbates on transition metal surfaces
… close-packed metal surfaces, namely hydrogen on Cu(111), Pd(111) and Ru(0001), carbon and oxygen on Ru(0001), and oxygen on Cu(111). Chapter 2 reviews the HeSE technique and describes the relevant dynamical models and statistical methods used to interpret data in later chapters. The performance …
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Supramolecular organisation, conformation and electronic properties of porphyrin molecules on metal substrates
The investigation and control of molecular properties is currently a dynamic research field. Here I present molecular level studies of porphyrin molecules adsorbed on metal surfaces via Low Temperature Scanning Tunneling Microscopy/Spectroscopy (STM/STS), supported by complementary X-ray absorption …
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Über den Einfluß von Oberflächendefekten auf Molekülschwingungen von Ethen auf der Kupfer(111)-Oberfläche : Schwingungsspektroskopische Untersuchung mit Elektronen und Infrarotlicht
… dieser Linien in IRRAS-Messungen an glatten Cu(111)-Oberflächen wurde in der vorliegenden Arbeit sowohl mit IRRAS als auch mit hochauflösender Elektronen-Energieverlustspektroskopie (HREELS) untersucht. Dabei konnte gezeigt werden, daß im Infrarotspektrum beobachtete Raman-aktive Schwingungen …
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Studying complex surface dynamical systems using helium-3 spin-echo spectroscopy
… aromatic adsorbate systems. Chapter 1 discusses the motivation for this work and compares HeSE with other techniques probing surface motion. Subsequently, an introduction to the HeSE method is given in Chapter 2, explaining the theoretical background and describing the main components of …
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Electrodeposition of Epitaxial Wide Bandgap P-Type Semiconductors and Copper Metal for Energy Conversion and Flexible Electronics
… on single-crystal surfaces. This research focuses on the epitaxial electrodeposition of wide bandgap p-type semiconductors and epitaxial Cu thin films via a self-assembled monolayer for energy conversion and flexible electronics. Paper I introduces the epitaxial electrodeposition of hole …
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Synthesis and Applications of Large-Area Monolayer Graphene
… adlayer-free, single-orientation graphene on Cu(111) foil and Cu(111) film/sapphire. A comparative analysis between these two substrates reveals critical differences in wrinkle density, grain size, and strain — offering insights for optimizing graphene growth. We further identify and …
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Orientation and chemistry of alkoxides on copper(111)
… alcohols with a preoxidized single-crystal Cu(111) surface under ultra-high vacuum conditions. The adsorbed alcohols deprotonate to form stable alkoxides chemisorbed to the surface. These alkoxides decompose at elevated temperatures by $\beta$-hydride elimination, desorbing as aldehydes. The …
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The adsorption of organic molecules on metal and semiconductor surfaces
The first part of this project focused on the effects of coadsorbates on the adsorption of organic molecules bonded to Cu(111). First, the influence of coadsorbed CO on the structure and bonding of thiophene was investigated using a combination of LEED, AES, TPD and synchrotron-based NIXSW and …
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Self-assembly of amino acids on noble metal surfaces : morphological, chemical and electronic control of matter at the nanoscale
… exploit the self-assembly capabilities of biomolecules yields a promising approach to control matter at the nanoscale. Here, the homochiral molecular self-assemblies of the methionine and tyrosine amino acids on the monocrystalline Ag(111) and Cu(111) surfaces are characterized by means of …
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Integrated Growth and Process Technology for Atomically Thin Single Crystal Films
… yielding mobilities approaching that of the current record holding exfoliated graphene based devices. In this work three fundamental issues for the production and application of graphene films are addressed. Firstly, the issue of minute catalyst contamination is systematically studied through …
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I. Bioanalytical Applications of Polymer Microfluidic Devices. II. Examination of Soft Vibrational Modes for Alkanes Adsorbed on Copper
… to be of interest in order to understand molecule-surface interactions related to C-H bond activation. Interest has also been enhanced by the presence of a unique spectral feature, a broad vibrational mode that is shifted to lower frequency from the normal C-H stretching region. This work …
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The effect of fluorination on the surface chemistry of adsorbate-metal systems
Ultra-high vacuum surface techniques are used to determine the effect of substituents (mainly fluorine) on the surface chemistry of several adsorbate-metal systems. In the first system, the effect of two substituent groups ($-$CH$\sb3$ and $-$F) on the kinetics of the phenyl coupling reaction on …
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Investigations of the Band Structure and Morphology of Nanostructured Surfaces
… graphene and electronic states created at the vacuum interface of single crystal copper surfaces. The characteristics of both electronic systems depend intimately on the morphology of the surfaces they inhabit. Thus, in addition to discussing the respective band structures of these systems, a …
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UHV-Studien zur oberflächenverstärkten Infrarotabsorption auf rauen Kupferfilmen
… von wenigen Nanometern Dicke sowie auf einem Cu(111)-Einkristall mittels IR-Transmissions- und IR-Reflexionsspektroskopie untersucht. Das wichtigste Adsorbatmolekül war hierbei das Ethylen, da hierzu zahlreiche vergleichende SERS-Daten vorliegen (SERS=oberflächenverstärkte Raman-Streuung). …
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Theoretical Study of Bistable Systems
… (SCO) complexes, archetype of bistable molecules, with two accessible spin states that can be tuned by external stimuli such as temperature or light. Spin-crossover complexes are potential candidates for applications in information storage, spintronics and molecular electronics. Their …
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