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41.
The adsorption of H2O on Al(111) has been studied by ESDIAD (electron stimulated desorption ion angular distributions), LEED (low energy electron diffraction), AES (Auger electron spectroscopy) and thermal desorption in the temperature range 80–700 K. At 80 K, H2O is adsorbed predominantly in molecular form, and the ESDIAD patterns indicate that bonding occurs through the O atom, with the molecular axis tilted away from the surface normal. Some of the H2O adsorbed at 80 K on clean Al(111) can be desorbed in molecular form, but a considerable fraction dissociates upon heating into OHads and hydrogen, which leaves the surface as H2. Following adsorption of H2O onto oxygen-precovered Al(111), additional OHads is formed upon heating (perhaps via a hydrogen abstraction reaction), and H2 desorbs at temperatures considerably higher than that seen for H2O on clean Al(111). The general behavior of H2O adsorption on clean and oxygen-precovered Al(111) (θO ? monolayer) is rather similar at low temperature, but much higher reactivity for dissociative adsorption of H2O to form OH adsis noted on the oxygen-dosed surface around room temperature. 相似文献
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Doná E Loerting T Penner S Minca M Menzel A Bertel E Schoiswohl J Berkebile S Netzer FP Zucca R Redinger J 《Physical review letters》2007,98(18):186101
Phase transitions in a quasi-one-dimensional surface system on a metal substrate are investigated as a function of temperature. Upon cooling the system shows a loss of long-range order, fluctuations, and a transition into an inhomogeneous ground state due to competition of local adsorbate-adsorbate interactions with an incommensurate charge density wave. This agrees with a general phase diagram for correlated systems and high-temperature superconductors. The model surface system allows direct imaging of the fluctuations and the glassy inhomogeneous ground state by scanning tunneling microscopy. 相似文献
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Indra Böhm Falko Strotmann Carsten Koopmans Isabel Wolf Hans‐Joachim Galla Helmut Ritter 《Macromolecular bioscience》2012,12(4):432-437
Polymeric β‐CD and poly{(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid sodium salt)‐co‐[6‐(acrylamido)‐N‐adamantylhexaneamide]} are synthesized to build in situ forming hydrogels based on host/guest interactions, so called physical hydrogels. The use of these hydrogels as a potential vitreous body substitute is discussed and recommended. Potential changes in cell morphology and cell vitality of the retinal ganglion cell line RGC‐5 are determined. DSC experiments with artificial membrane structures are performed. The analyses show that β‐CD overrides the harmful effects of the highly toxic adamantyl‐modified polymer. Although the final hydrogel is considered to be biocompatible, the application as a biomaterial has to be reconsidered.
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Berkebile S Ules T Puschnig P Romaner L Koller G Fleming AJ Emtsev K Seyller T Ambrosch-Draxl C Netzer FP Ramsey MG 《Physical chemistry chemical physics : PCCP》2011,13(9):3604-3611
Well-ordered and oriented monolayers of conjugated organic molecules can offer new perspectives on surface bonding. We will demonstrate the importance of the momentum distribution, or symmetry, of the adsorbate molecules' π orbitals in relation to the states available for hybridization at the metal surface. Here, the electronic band structure of the first monolayer of sexiphenyl on Cu(110) has been examined in detail with angle-resolved ultraviolet photoemission spectroscopy over a large momentum range and will be compared to measurements of a multilayer thin film and to density functional calculations. In the monolayer, the one-dimensional intramolecular band structure can still be recognized, allowing an accurate determination of orbital modification upon bonding and the relative energetic positions of the electronic levels. It is seen that the character of the molecular π orbitals is largely maintained despite strong mixing between Cu and molecular states and that the lowest unoccupied molecular orbital (LUMO) is filled by hybridization with Cu s,p states rather than through a charge transfer process. It is also shown that the momentum distribution of the substrate states involved and the periodicity of the molecular overlayer play a large role in the final E(k) distribution of the hybrid states. The distinct momentum distribution of the LUMO, interacting with the Cu substrate s,p valence bands around the gap in the surface projection of the bulk band structure, make this system a particularly illustrative example of momentum resolved hybridization. This system demonstrates that, for hybridization to occur, not only do states require overlap in energy and space, but also in momentum. 相似文献
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Wolfram Steurer Svetlozar Surnev Alessandro Fortunelli Falko P. Netzer 《Surface science》2012,606(9-10):803-807
The imaging of NiO(100)(1 × 1) islands embedded in Ag(100) by scanning tunneling microscopy is addressed. As a function of tunneling conditions and tip termination it is possible to resolve the NiO–vacuum interface, the second oxide layer as well as the NiO-substrate interface with atomic contrast. We find that for sub-monolayer coverages of NiO the oxide islands consist of an essentially defect-free surface layer at the vacuum interface with a number of NiO second layer patches incorporated into the Ag substrate underneath. The oxide layer is surrounded by a rim of a NiO bilayer of monoatomic width. A reduction of the density of states between a NiO monolayer and local NiO bilayer stackings is suggested to be responsible for the observed appearance of mosaic patches at the island surface. 相似文献