Global ETD Search
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 59 for “"Surface sensitive"”.
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Characterization of Anodic Fuel Cell Catalysts Utilizing Various Surface Sensitive Techniques
… which indicated the presence of palladium on the surface and smaller particle sizes. It also revealed a potential tool for determining the poison from formic acid oxidation on palladium nanoparticles. Further, the efficacy of methyl formate oxidation on the catalyst was examined. This fuel was …
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Surface-Enhanced Spectroelectrochemistry using Synchrotron Infrared Radiation
… challenges. Sampling the ESI requires a surface-sensitive spectroscopy capable of addressing a buried interface, placing strong limitations on photon energy and spectroelectrochemical cell design. Furthermore, dynamic measurements are fundamentally limited by the finite rise time of the …
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SURFACE SCIENCE APPROACH TO ATOMIC LAYER DEPOSITION CHEMISTRY
… and microelectronic devices. In this work, surface sensitive characterization techniques have been employed to investigate initial precursor-substrate reactions and ALD surface chemistry.
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SYNTHESIS, CHARACTERIZATION, AND KINETIC EVALUATION OF PLANAR AND SUPPORTED HETEROGENEOUS CATALYSTS
… of bimetallic Pt-M (M = Re, Mo) catalysts using surface sensitive techniques and theory.
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Deposition and characterisation of perovskite thin films
… of scanning electron mi-croscopy and bulk/surface elemental compositional techniques con-firmed morphological improvement due to the presence of Cl ionsdespite being undetected using surface sensitive techniques.
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Operando fibre Raman sensors for Li-ion battery chemistry
… fibres and spectroscopy provides a chemically sensitive sensor that can be embedded directly into the battery with minimal disturbance to the cell operation. This thesis aims to develop and characterise an operando fibre-optic Raman probe, enhanced solely by optical phenomena, sensitive to the …
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Surface magnetic order of ultra thin epitaxial vanadium films on silver
… by electron capture spectroscopy(ECS). ECS is a surface-sensitive technique for the investigation of magnetic order existing at surfaces. It is found that the topmost atomic layer of V(100) films are ferromagnetic for all film thicknesses, in contrast to bulk vanadium which is paramagnetic at all …
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Plasmachemical Functionalisation for Modification of Surfaces with Biomolecules and Metals
… functionalisation offers a versatile route to surface functionalisation, allowing a wide variety of functional groups to be deposited in a substrate independent process. This thesis presents the application of pulsed plasmachemical functionalisation in two areas. Firstly, the construction of …
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Studies of Structure and Reactivity in Monolayer Assemblies: 1. Ozonolysis of Alkanethiolate Self Assembled Monolayers on Au. 2. In-Plane Resistivity of Ultrathin Gold Films as a High Sensitivity, Molecularly Differentiated Probe of Chemisorption at the Liquid-Metal Interface
… mean free path ( d ∼ 80 nm), display surface-sensitive resistivities, which have been exploited to follow the adsorption and desorption of molecular monolayers at the metal solution interface with high precision. For nominal Au film thicknesses (d ∼ 40 nm), strongly chemisorbed …
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Synthesis and surface chemistry of zinc oxide nanowires for chemical sensor applications
… of high quality ZnO nanowires for highly sensitive and selective p-nitrophenol vapor sensor. High-quality ZnO nanowires were synthesized through a vapor-liquid-solid process in a customized chemical vapor deposition furnace. Scanning electron microscopy, transmission electron microscopy, …
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Planar Tunneling and Andreev Bound State Spectroscopy of YBa2Cu3O7- d Thin Films Using Solution-Deposited Zirconia Insulators
… orientations. Since tunneling is a highly surface-sensitive probe on YBCO, films have been optimized for high surface quality. To fabricate the tunneling insulator, a novel fabrication technique has been developed through solution condensation and hydrolysis of zirconia, which has proven to …
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On Quantum Reflection and The Casimir Effect : Application to atom-surface scattering
Quantum reflection of the light, neutral and surface sensitive 3He-atom is a novel method for investigating long-range attractive atom-surface potentials. This thesis presents the detailed analysis of experimental data obtained with the Atomic Beam Spin Echo (ABSE) spectrometer by scattering 3He …
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XPS and transport studies of oxide barriers in tunnel magnetoresistance junctions
… Al layers (1-2 nm) was monitored by XPS a surface sensitive and element specific technique. The oxidation process and kinetics were analysed in terms of the Cabrera-Mott theory of thin film oxidation. Evidence is found in the XPS spectra of the Al 2p core levels for the existence of a …
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Siloxane modified polyurea and polyurethane urea segmented copolymers
… between the segments. In addition, the surface structure of segmented polyether urea and polyurethane urea copolymers were modified in two ways: siloxane urea segmented copolymers were synthesized and physically blended into the system, and siloxane oligomers of controlled molecular …
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The Use of Synchrotron Radiation to study Overgrowth Phenomena in InAs/GaAs Nanostructures
… nanostructures using synchrotron radiation. Surface-sensitive grazing incidence small angle x-ray scattering (GISAXS) and grazing incidence diffraction (GID) are applied to study shape, strain, and interdiffusion in self-organised grown nanostructures. The technique of anomalous x-ray …
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Strukturierung und Modifizierung von Polymeren mit UV-Laserstrahlung für life science Anwendungen
… in life science applications. The laser treated surfaces were characterized by a variety surface sensitive of methods. In these polymers different surface topologies were generated by ablation in order to study their wetting properties by measurement of water contact angles. With this protocol it …
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Growth and magnetotransport studies of epitaxial graphene
… in ultra-high vacuum conditions, forming a surface layer consisting of a few atomic layers of graphitic carbon (graphene) arranged in known crystallographic register with the substrate material. The layers of graphene on the (0001) face form the subject of the thesis, and their surface …
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Local imaging of magnetic flux in superconducting thin films
… on rough as-prepared thin films. Since the surface roughness (droplets, precipitates) causes a severe problem to the scanning MFM tip, a nanoscale wedge polishing technique that allows to overcome this problem was developed. Mounting the sample under a defined small angle results in a smooth …
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Global estimation of precipitation using opaque microwave bands
… methods for estimating precipitation rate using surface-sensitive microwave window channels have been developed by others. The algorithm involves a set of signal processing components whose outputs are fed into a neural net to produce a rain rate estimate for each 15-km spot. The signal …
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High temperature SO2 chemisorption on model systems. Implications for in-plume processes.
… may form S, F and Cl salts and acids on ash surfaces, though the mechanisms and controlling variables remain poorly understood. A limited mechanistic understanding impedes estimation of volcanic volatile budgets and may also prevent assessment of environmental impacts resulting from volatile …
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