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Showing 1 to 20 of 21 for “"RAIRS"”.
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A Window into Selective Catalytic Reduction: a RAIRS Study of NO and NH3 on Cu{311}
… reflection-absorption infrared spectroscopy (RAIRS). In addition to the bare Cu{311} surface, the interaction of NO and NH3 with the various oxygen phases of the Cu{311} surface phases was also studied. Several other techniques were used in tandem to support the study, such as low energy …
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Metal deposition on TiO2(110) via thermal evaporation, photolysis and thermolysis: a combined FT-RAIRS and XPS study
… K. Using CO as a probe adsorbate molecule, FT-RAIRS revealed that Cu islands with sizes less than ca. 3.5 nm exhibited predominantly high Miller Index surfaces, whereas larger islands exhibited (110), (100) and (111) facets. By comparing XPS and FT-RAIRS results collected before and after …
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The Direct Dissociation of Methanol on V(100) Surfaces
… of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD). At surface temperatures of 100 K, it was found that methanol adsorbs onto the vanadium surface dissociatively. While RAIRS experiments suggest that methanol and products desorb from the surface at …
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Fundamental Studies of Reactions between NO3 Radicals and Organic Surfaces
… reflection-absorption infrared spectroscopy (RAIRS). The oxidation states of surface-bound molecules were identified with X-ray photoelectron spectroscopy (XPS). Consumption of vinyl groups was observed concurrently with formation of organic nitrates in RAIRS. XPS spectra showed little …
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Spectroscopic and electrochemical investigation of phenyl, phenoxy, and hydroxyphenyl-terminated alkanethiol monolayers
… Reflectance Absorbance Infrared Spectroscopy (RAIRS), contact angle goniometry, ellipsometry, reductive desorption cyclic voltametry, and impedance spectroscopy. Several aromatic C-C vibrational frequencies in the RAIRS spectra, for SAMs of 1-8, reveal a dependence of peak intensity on …
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Interfacial Reaction of an Olefin-Terminated Self-Assembled Monolayer Exposed to Nitrogen Dioxide: An Investigation Into the Reaction Rate and Mechanism
… Reflection-Absorption Infrared Spectroscopy (RAIRS). This unsaturated surface was then exposed to NO2 at a pressure of 1x10-4 mbar in a UHV (Ultrahigh Vacuum) chamber. Time-resolved RAIRS was preformed in situ to monitor the reaction during exposure. X-ray Photoelectron Spectroscopy and RAIRS …
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Self-Assembled Monolayers As Models For Silica
… reflectance-absorbance infrared spectroscopy (RAIRS). Diagnostic vibrational modes were assigned by comparing RAIRS spectra to normal mode frequencies and intensities calculated using DFT methods at the 6-31G* level using commercial software. Water droplet goiniometry found contact angles of …
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Ultrahigh Vacuum Studies of the Reaction Mechanisms of Ozone with Saturated and Unsaturated Self-Assembled Monolayers
… reflection absorption infrared spectroscopy (RAIRS) and mass spectrometry. The chemical identity of adsorbates on a surface can also be determined before or after a reaction with X-ray photoelectron spectroscopy (XPS). Disordering of the monolayers concurrent with the disappearance of the …
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Area selective atomic layer deposition of silicon dioxide on silicon dioxide using surface passivation of copper non-growth surface
… reflection absorption infrared spectroscopy (RAIRS) and x-ray photoelectron spectroscopy (XPS) we indicate minimal accumulation of SiO2 on Cu surface at 100 °C and partial oxidation of Cu surface for both O3 and O2 plasma-based processes. We also demonstrate that the amount of HT degraded by …
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Understanding the Surface Induced Phosphorylation of Prebiotic Molecules by Schreibersite
… by reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TPD). At surface temperatures of approximately 130 K, H<sub>2</sub>O interacts with Fe-P bridge sites while CH<sub>3</sub>OH does not appear to interact with surficial phosphorus. The interaction between …
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Investigation of the Structure of Alkyne Self-Assembled Monolayers on Gold and the Development of Matrix-Enhanced Secondary Ion Mass Spectrometry Methods
… A reflection adsorption infrared spectroscopy: RAIRS) system was constructed and tested. The instrument comprises an Fourier transform infrared: FTIR) spectrometer, an optical pathway and a vacuum chamber. The RAIRS system is designed to investigate in situ the interaction of vapor-deposited …
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Investigations of Bacteria Viability on Surfaces Using ω-functionalized Alkanethiol Self-Assembled Monolayers
… by reflection-absorption infrared spectroscopy (RAIRS) and X-ray photoelectron spectroscopy (XPS). Determination of the viability of Escherichia coli on the surfaces was performed via the antibacterial assay. In the assay, a culture of E. coli was sprayed onto the surfaces using a chromatography …
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Poly(L-Lactic Acid) Langmuir Monolayers at the Air/Water Interface and Langmuir-Blodgett Films on Solid Substrates: Phase Behavior, Surface Morphology, and Crystallinity
… and reflection absorption infrared spectroscopy (RAIRS) measurements on PLLA LB-films are consistent with PLLA existing as single molecule 10/3-helices at the A/W interface. Morphologies observed after collapse of the LC monolayer are dependent upon the collapse mechanism and subsequent thermal …
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Ultrahigh Vacuum Studies of the Reaction Kinetics and Mechanisms of Nitrate Radical with Model Organic Surfaces
… reflection-absorption infrared spectroscopy (RAIRS) to monitor bond rupture and formation while a well-characterized flux of NO3 impinges on the organic surface. Overall, the reaction kinetics and mechanisms were found to depend on the terminal functional group of the SAM and incident energy …
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The synthesis and characterisation of Langmuir-Blodgett film forming TCNQ adducts.
… reflectance-absorption infrared spectroscopy (RAIRS) and surface plasmon resonance (SPR).A number of N-alkylpyridinium benzimidazolate betaine derivatives and the related betaine-TCNQ adducts were prepared and their LB film forming properties were studied.
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Fundamental Studies of Two Important Atmospheric Oxidants, Ozone and Hydroxyl Radical, Reacting with Model Organic Surfaces
… Reflection Absorption Infrared Spectroscopy (RAIRS). Ozone was found to add to pentacene non-selectively and form a range of products after heavy ozone exposure. The rate limiting step had an activation energy of 17 kJ/mol, which is consistent with the findings of previous ozone oxidation …
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The Reactivity of Chemical Warfare Agent Simulants on Carbamate Functionalized Monolayers and Ordered Silsesquioxane Films
… reflection-absorption infrared spectroscopy (RAIRS), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD) measurements. In conjunction with surface probes, uptake coefficients were monitored according to the King and Wells direct reflection technique. The …
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Reflection Absorption Infrared Spectroscopic Studies of Surface Chemistry Relevant to Chemical and Biological Warfare Agent Defense
… synthesized and subsequently characterized using RAIRS and X-ray photoelectron spectroscopy (XPS). 2) The determination of the surface conformation, orientation, and relative surface density of immobilized antimicrobial peptides. Our results revealed that the peptides consisted of tilted (50-60°), …
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Vibrational Spectroscopic Studies of Degradation and Diffusion Processes in Poly(ethylene terephthalate)
… to undergo hydrolysis. Complex changes in the RAIRS spectrum were related to changes in the polymeric structure, resulting from degradation. The autocatalytic nature ofthe degradation was highlighted, as was the loss of(small) mobile species from the polymer matrix. Amechanism involving the …
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Influence of Molecular Orientation and Surface Coverage of w-Functionalized Mercaptans on Surface Acidity
The compounds 12-phenoxy-dodecane-1-thiol, 4-dodecyloxymercaptophenol and 3-dodecyloxymercaptophenol have been synthesized using a novel synthesis to investigate the effect that the orientation of the functional group has on surface acidity. 3-dodeycloxymercaptophenol and 4-dodecyloxymercaptophenol …
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