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Showing 1 to 18 of 18 for “"XPS spectra"”.
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
… images and scanning tunneling spectroscopy (STS) spectra of galena (PbS) and hematite (a-Fe203) were calculated using ab-initio methods in order to interpret experimental images and spectra that were taken in previous studies. These calculations have helped to understand which states of the …
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Characterization of bio-hybrid interfaces under ambient conditions
… (LEED), and X-ray photoelectron spectroscopy (XPS) in ultra-high vacuum (UHV) and near-ambient-pressure (NAP) conditions were used for this investigation. Monochromatic X-ray 𝐴𝐴𝐴𝐴 𝐾𝐾𝐾𝐾 radi ation (ℎ𝜋𝜋 = 1486.7𝑒𝑒𝑉𝑉) was the exc itat ion source for the XPS experiments. The results obtained …
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EXPLORATION OF TM-NX ORR ELECTROCATALYSTS FROM FIRST PRINCIPLE CALCULATIONS
… interdependent. Additional focus will also be on XPS characterization for the identification of the nature of proposed catalytic site(s). Although XPS is a widely used experimental technique for this purpose, the unique identification of structural motifs from XPS observations alone remains …
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Fundamental Studies of Reactions between NO3 Radicals and Organic Surfaces
… with X-ray photoelectron spectroscopy (XPS). Consumption of vinyl groups was observed concurrently with formation of organic nitrates in RAIRS. XPS spectra showed little oxidation of sulfur head groups. The observed rate constant was determined based on the consumption of carbon-carbon …
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Study of Interactions Between Diffusion Barrier Layers and Low-k Dielectric Materials for Copper/Low-k Integration
… such as X-ray photoelectronic spectroscopy (XPS), transmission electron microscopy (TEM), and atomic force microscopy (AFM) are employed. Ta sputter-deposited onto a Si-O-C low dielectric constant substrate forms a reaction layer composed of Ta oxide and TaC. The composition of the reaction …
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Superconductivity and low temperature properties of niobium diselenide single crystals grown by direct vapor transport
… crystals. X-ray photoelectron spectroscopy (XPS) measurements were made of the oxidation state of niobium on the surface and in the bulk of 2H-NbSe₂ samples prepared by the DVT and iodine vapor transport (IVT) procedures. These measurements indicated the niobium on the surface of the IVT …
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Characterization of amorphous silicon carbide and silicon carbonitride thin films synthesized by polymer-source chemical vapor deposition mechanical structural and metal-interface properties
… (ERD) and X-ray photoelectron spectroscopy (XPS) techniques were used to determine the elemental composition of the films and of their interface with substrates, while X-ray reflectivity measurements (XRR) were used to account for the film density. Spectral deconvolution was used to extract …
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Structural role of nitrogen in phosphorus oxynitride glasses
… at Sandia National Laboratories and the NMR spectra were measured at the University of Illinois-Urbana. Samples for the NMR measurements had to be prepared with <sup>15</sup>N in the form of <sup>15</sup>NH<sub>3</sub>. Because of the expense of <sup>15</sup>N ammonia, this author developed a …
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THE ATTACHMENT AND CHARACTERIZATION OF DNA PROBES ON GaAs-BASED SEMICONDUCTOR SURFACES
… using x-ray photoelectron spectroscopy (XPS), and the surface morphology was obtained using atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). In addition, I studied the effect of DNA length and the presence of a good solvent, such as water, on the …
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Multidentate Alkanethiols with Cyclohexyl and Pyridyl Frameworks Forming Self-Assembled Monolayers on Gold
… and X-ray photoelectron spectroscopy (XPS). CyTSH was found to generate multilayer thin films with many unbound thiol species and oxidized sulfur moieties (e.g., disulfides and sulfone). In contrast, 3C1CyTSH was found to generate monolayer films in which ~90% of the thiols were bound …
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CORROSION PROTECTION OF COPPER IN OILY MEDIA: MICROSCOPIC MECHANISMS
… oily medium analogous to automotive lubricants.XPS and ToF-SIMS characterization were carried out on TTAH adsorption films formed on pristine Cu surfaces immersed in 0.01 wt. % TTAH oil solution at room temperature for immersion times ranging from 1 s to 0.6 Ms. Instantaneous complete coverage …
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Effect of cold ammonia gas plasma irradiation on dyeability of poly(m-phenylene isophthalamide) fibers with acid dyes
… analyzed by x-ray photoelectron spectroscopy (XPS). The surface amine concentration was evaluated by studying the plasma amination kinetics through ion-exchange reactions between the ionic dye Ponceau Red 3R and Nomex filament yarn. Surface topology of plasma irradiated filament yarns was …
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Experimental Adsorption and Reaction Studies on Transition Metal Oxides Compared to DFT Simulations
… sites for CH3- fragments in accordance with XPS spectra, while PBE+U did not. Both PBE and PBE+U failed to predict the correct adsorption sites for CH₂=. When the simulation is set in accordance with the experimentally observed adsorption sites for the carbon species, PBE gives very accurate …
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An Investigation of Plasma Pretreatments and Plasma Polymerized Thin Films for Titanium/Polyimide Adhesion
… studied using x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), Fourier transform infrared analysis (FTIR), and contact angle measurements. Relationships between composition, mechanical properties, and adhesion of PP films on Ti-6Al-4V and silicon wafers were …
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Study of Chemical States, Composition and Adsorption Behavior of Iron Coated Granular Activated Carbon (Fe-GAC) for Selenate Removal and Feasible Adsorbent Modifications
… cation radius.;X-ray photoelectron spectroscope (XPS) was used to investigate the chemical state and composition of coated iron on GAC surface. The multiplet peak fitting results for high resolution XPS spectra for O1s and Fe2p3/2 indicated that Fe(III) was formed after coated with 0.1 M ferrous …
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Interfacial Energy Transfer in Small Hydrocarbon Collisions with Organic Surfaces and the Decomposition of Chemical Warfare Agent Simulants within Metal-Organic Frameworks
… (IR), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), and DFT calculations. DMMP and DMCP were found to adsorb molecularly (physisorption) to the MOFs through the formation of hydrogen bonds between the phosphoryl oxygen and the free hydroxyl groups associated …
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Plasma Facing Components conditioning techniques and their correlation with plasma performance in the National Spherical Torus eXperiment Upgrade (NSTX-U)
… surface using X-ray Photoelectron Spectroscopy (XPS) in-situ. Several ATJ graphite samples were exposed to boronization and multiple plasma discharges and MAPP was used to monitor their surface chemistry at the end of each day of plasma operations (around 10 to 20 plasma shots). According to the …
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Processing and Characterization of Device Solder Interconnection and Module Attachment for Power Electronics Modules
… devices. X-Ray Photoelectron Spectroscopy (XPS) Spectra showed evidence of possible carbon contaminants, such as carbide (~282.9eV) and graphite (~284.3eV) on the surface at binding energies below the binding energy of the hydrocarbon peak (C 1s at 285eV). Whereas above the hydrocarbon peak …