Browsing by Keywords "XPS"
Now showing items 1-20 of 55
-
Analysis of Fe nanoparticles using XPS measurements under d.c. or pulsed-voltage bias
(2010)The impact of solution exposure on the charging properties of oxide coatings on Fe metal-core oxide-shell nanoparticles has been examined by sample biasing during XPS measurements. The Fe nanoparticles were suspended in ... -
Analysis of surface structures using XPS with external stimuli
(Springer, Dordrecht, 2006)X-ray Photoelectron Spectroscopy, XPS, due to the perfect match of its probe length (1-10 nm) to nanoparticle size, chemical specificity, and susceptibility to electrical charges, is ideally suited for harvesting chemical, ... -
Band-Bending at buried SiO2/Si interface as probed by XPS
(American Chemical Society, 2013)X-ray photoelectron spectroscopy is used to probe the photoinduced shifts in the binding energies of Si2p, O1s, and C1s of the SiO2/Si interfaces of a number of samples having oxide and/or thin organic layers on top of p- ... -
BaOx
(Bilkent University, 2011)In this work, formation anddecomposition pathways of of Ba(NO3)2 on BaOBaO2 /Pt(111) surfaces were investigated at the molecular levelfordifferent BaOBaO2coverages starting from small 2D islands of 0.5 MLE (MLE: ... -
BaOx/ Pt(111) AND BaOx/ TiO2/ Pt(111) MODEL CATALYSTS FOR UNDERSTANDING NOx STORAGE-REDUCTION (NSR) CATALYSIS AT THE MOLECULAR LEVEL
(Bilkent University, 2011)In this work, formation anddecomposition pathways of of Ba(NO3)2 on BaOBaO2 /Pt(111) surfaces were investigated at the molecular levelfordifferent BaOBaO2coverages starting from small 2D islands of 0.5 MLE (MLE: ... -
Carbon supported nano-sized Pt-Pd and Pt-Co electrocatalysts for proton exchange membrane fuel cells
(2009)Nano-sized Pt-Pd/C and Pt-Co/C electrocatalysts have been synthesized and characterized by an alcohol-reduction process using ethylene glycol as the solvent and Vulcan XC-72R as the supporting material. While the Pt-Pd/C ... -
Ceria promoted NOx storage and reduction materials
(Bilkent University, 2011)In the current work, the effect of CeO2 promotion on the NOx storage materials and NOx storage-reduction (NSR) catalysts is studied. Synthesized materials were prepared using different baria and ceria loadings in order ... -
Characterization of denture acrylic resin surfaces modified by glow discharges
(Sage Publications, Inc., 1997)Resin samples prepared by compression molding using a poly (methyl methacrylate) (PMMA) denture base material were exposed to radio-frequency (rf) glow discharges to improve the wettability of the material. Fourier transform ... -
Charging/discharging dynamics of CdS and CdSe films under photoillumination using dynamic x-ray photoelectron spectroscopy
(A I P Publishing LLC, 2010)Thin films of CdS and CdSe are deposited on HF-cleaned Si O2 /Si substrates containing ∼5 nm thermally grown silicon oxide. x-ray photoelectron spectroscopy (XPS) data of these films are collected in a dynamic mode, which ... -
Chemistry and structure of sputter deposited boron-carbon-nitrogen thin films
(Bilkent University, 2012)There is a growing interest in synthesizing new materials with unique mechanical properties like hardness or electrical and optical properties. For this purpose, Boron-Carbon-Nitrogen (BCN) ternary phase diagram promises ... -
Collagen-chitosan scaffold modified with Au and Ag nanoparticles: synthesis and structure
(Elsevier B.V., 2016)Nowadays, the dermal biomimetic scaffolds are widely used in regenerative medicine. Collagen-chitosan scaffold one of these materials possesses antibacterial activity, good compatibility with living tissues and has been ... -
Combined XPS and contact angle studies of ethylene vinyl acetate and polyvinyl acetate blends
(Elsevier, 2011-09-01)In this study, we prepared thin films by blending ethylene vinyl acetate copolymers (EVA) containing 12-33 (wt.%) vinyl acetate (VA) with polyvinyl acetate (PVAc) and high density polyethylene homopolymers. Large area ... -
Deposition and stability of metal ions on oxidized silicon surfaces: electrochemical correlation
(Elsevier Science Publishers, 2001)XPS is used to determine the chemical state of Au, Hg, Tl, Pb and Bi deposited from their corresponding aqueous solutions on oxidized silicon or gold surfaces. It is determined that Au and Hg, having positive electrochemical ... -
Dynamical XPS measurements for probing photoinduced voltage changes
(2010)Photoillumination with 405 nm laser causes shifts in XPS peaks of n-Si(100), and CdS. To distinguish between surface photovoltage (SPV), and charging, dynamical measurements are performed, while sample is subjected to ... -
Effect of reactor pressure on optical and electrical properties of InN films grown by high-pressure chemical vapor deposition
(Wiley - V C H Verlag GmbH & Co. KGaA, 2015)The influences of reactor pressure on the stoichiometry, free carrier concentration, IR and Hall determined mobility, effective optical band edge, and optical phonon modes of HPCVD grown InN films have been analysed and ... -
Electrochemical and XPS studies of corrosion behaviour of a low carbon steel in the presence of FT2000 inhibitor
(Elsevier Science Publishers B.V., 2001)Corrosion behaviour of a new inhibitor (FT2000) is investigated in saline solution on a low carbon steel in the neutral aqueous media at 60 °C. Effect of sulphate ion is also studied. Corrosion rate, polarization resistance, ... -
Electrooxidation of methanol on doped polypyrrole films in acidic media
(Elsevier, 2001-04-06)Electrooxidation of methanol was realised on platinum and perchlorate anion doped polypyrrole film electrodes in acidic media. A systematic kinetic investigation was performed and optimum experimental conditions for the ... -
Evaluation of silver content and antibacterial activities of silver loaded fiber/cotton blended textile fabrics
(2010)The aims of this work were to analyze the antibacterial activity and laundering durability of the silver loaded cellulosic fiber/cotton blended antibacterial textile fabrics, to quantify the silver content present in ... -
Fe promoted NOx storage materials: structural properties and NOx uptake
(American Chemical Society, 2010)Fe promoted NOx storage materials were synthesized in the form of FeOx/BaO/Al2O3 ternary oxides with varying BaO (8 and 20 wt %) and Fe (5 and 10 wt %) contents. Synthesized NOx storage materials were investigated via TEM, ... -
Fine-tuning the dispersion and the mobility of BaO domains on NO x storage materials via TiO2 anchoring sites
(American Chemical Society, 2010)In an attempt to control the surface dispersion and the mobility of BaO domains on NOx storage materials, TiO2/TiOx anchoring sites were introduced on/inside the conventional γ-Al 2O3 support matrix. BaO/TiO2/Al 2O3 ternary ...
