Journal ArticleDOI
Determination of the concentration of surface hydroxyl groups on metal oxide films by a quantitative XPS method
E. McCafferty,J. P. Wightman +1 more
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TLDR
In this article, a mathematical expression has been derived to give the concentration of surface hydroxyl groups as a function of the intensity ratio of the OH to O2− contributions to the O 1s photopeak.Abstract:
Quantitative XPS has been used to determine the surface concentration of hydroxyl groups in native air-formed oxide films on metals having low surface areas. A mathematical expression has been derived to give the concentration of surface hydroxyl groups as a function of the intensity ratio of the OH to O2− contributions to the O 1s photopeak. This expression is based on modeling the oxide film on a metal to be a multilayer system consisting of an outermost layer of organic contamination, a layer of chemisorbed water, a surface hydroxylated region of the oxide film and the inner portion of the oxide film. The average values of the experimentally determined concentrations of surface hydroxyl groups are 15, 13, 11, 6 and 8 OH nm−2 for oxide-covered aluminum, chromium, titanium, tantalum and silicon, respectively. X-ray photoelectron spectroscopy depth profiles using argon ion sputtering and variable-angle XPS have been utilized in this work. Surface treatments have employed either ultrasonic cleaning with organic solvents or argon plasma treatment. © 1998 John Wiley & Sons, Ltd.read more
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Journal ArticleDOI
Increasing Solar Absorption for Photocatalysis with Black Hydrogenated Titanium Dioxide Nanocrystals
TL;DR: It is shown that disorder-engineered TiO2 nanocrystals exhibit substantial solar-driven photocatalytic activities, including the photo-oxidation of organic molecules in water and the production of hydrogen with the use of a sacrificial reagent.
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Hydrogen-Treated TiO2 Nanowire Arrays for Photoelectrochemical Water Splitting
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Structure and physicochemistry of anodic oxide films on titanium and TA6V alloy
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TL;DR: In this paper, the morphological, structural and physicochemical characterization of anodic oxide films grown on titanium and Ti-6Al-4V (TA6V) in chromic acid solution without (CA) or with (CA/HF) hydrofluoric acid addition is discussed.
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XPS and FTIR Surface Characterization of TiO2 Particles Used in Polymer Encapsulation
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