نتایج جستجو برای: rutile

تعداد نتایج: 2508  

Journal: :Catalysis Today 2023

It is widely accepted that the photocatalytic efficiency of TiO2 can be enhanced by modifying its surface with noble metal nanoparticles, such as Ag. On TiO2, Ag nanoparticles are exposed to rapid oxidation, resulting AgxO. Therefore, in present work, activities composites were investigated. They consisted commercial titanium dioxide mixtures (Aldrich anatase and rutile) well-defined ratios whi...

2014
Lei Yang Miao Zhang Shiwei Shi Jianguo Lv Xueping Song Gang He Zhaoqi Sun

Highly ordered TiO2 nanotube array (TN) films were prepared by anodization of titanium foil in a mixed electrolyte solution of glycerin and NH4F and then annealed at 200°C, 400°C, 600°C, and 800°C, respectively. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), water contact angle (WCA), and photoluminescence (PL). It was found that low temperature (...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2005
B Montanari P Ballone T Mazza P Milani

A broad survey of harmonic dynamics in AB(2) clusters with up to N = 3000 atoms is performed using a simple rigid ion model, with ionic radii selected to give rutile as the ground state structure for the corresponding extended crystal. The vibrational density of states is already close to its bulk counterpart for N∼500, with characteristic differences due to surfaces, edges and vertices. Two me...

2016
Verena Pfeifer Travis E. Jones Juan J. Velasco Vélez Cyriac Massué Rosa Arrigo Detre Teschner Frank Girgsdies Michael Scherzer Mark T. Greiner Jasmin Allan Maike Hashagen Gisela Weinberg Simone Piccinin Michael Hävecker Axel Knop-Gericke Robert Schlögl

Iridium-basedmaterials are among themost active and stable electrocatalysts for the oxygen evolution reaction. Amorphous iridium oxide structures are found to bemore active than their crystalline counterparts. Herein, we combine synchrotron-based X-ray photoemission and absorption spectroscopies with theoretical calculations to investigate the electronic structure of Ir metal, rutile-type IrO2,...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2010
Xiang Wu Eva Holbig Gerd Steinle-Neumann

A new study on the pressure-induced phase transitions of TiO(2) has been performed using all-electron density-functional theory based computations with the projector augmented wave and the linearized augmented plane wave methods considering five experimentally observed structures. The static results yield a picture that is consistent with experiments, i.e., phase transitions with pressure are p...

Journal: :The journal of physical chemistry letters 2013
Zhenxing Feng Junling Lu Hao Feng Peter C Stair Jeffrey W Elam Michael J Bedzyk

We explore how the atomic-scale structural and chemical properties of an oxide-supported monolayer (ML) catalyst are related to catalytic behavior. This case study is for vanadium oxide deposited on a rutile α-TiO2(110) single-crystal surface by atomic layer deposition (ALD) undergoing a redox reaction cycle in the oxidative dehydrogenation (ODH) of cyclohexane. For measurements that require a ...

2011
Min Gao Andrey Lyalin Tetsuya Taketsugu

It is demonstrated that the support effects play a crucial role in the gold nanocatalysis. Two types of support are considered—the “inert” support of hexagonal boron nitride (h-BN) with the N and B vacancy defects and the “active” support of rutile TiO2(110). It is demonstrated that Au and Au2 can be trapped effectively by the vacancy defects in h-BN. In that case, the strong adsorption on the ...

2001
X. Q. Pan

We studied the structural behavior and electrical transport properties of epitaxial a-SnO thin films grown on the (1̄012) a-Al2O3 ~sapphire! substrate. Hall effect measurements revealed that the epitaxial as-deposited SnO film is a p-type semiconductor. In situ x-ray diffraction studies show that the a-SnO phase is metastable and will transform into SnO2 with the rutile type structure when annea...

Journal: :Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry 1962

Journal: :Scientific Reports 2017

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