Hydroxylated a-Al2O3 (0001) surfaces and metal/a-Al2O3 (0001) interfaces
نویسندگان
چکیده
X-ray photoelectron spectroscopy was applied to study the hydroxylation of a-Al2O3 (0001) surfaces and the stability of surface OH groups. The evolution of interfacial chemistry of the a-Al2O3 (0001) surfaces and metal/a-Al2O3 (0001) interfaces are well illustrated via modifications of the surface O1s spectra. Clean hydroxylated surfaces are obtained through waterand oxygen plasma treatment at room temperature. The surface OH groups of the hydroxylated surface are very sensitive to electron beam illumination, Ar sputtering, UHV heating, and adsorption of reactive metals. The transformation of a hydroxylated surface to an Al-terminated surface occurs by high temperature annealing or Al deposition. 2006 Elsevier B.V. All rights reserved.
منابع مشابه
Atomic simulations of kinetic friction and its velocity dependence at Al/Al and -Al2O3/ -Al2O3 interfaces
Kinetic friction during dry sliding along atomistic-scale Al 001 /Al 001 and -Al2O3 0001 / -Al2O3 0001 interfaces has been investigated using molecular dynamics MD with recently developed Reactive Force Fields ReaxFF . It is of interest to determine if kinetic friction variations predicted with MD follow the macroscopic-scale friction laws known as Coulomb’s law for dry sliding and Stokes’ fric...
متن کاملA first principles study of the interaction between two-dimensional black phosphorus and Al2O3 dielectric
The chemical degradation of exfoliated black phosphorus (BP) when exposed to ambient conditions can be effectively suppressed via the deposition of Al2O3 dielectric on the BP surface. A good understanding of the interactions between the BP layer and Al2O3 dielectric is important for practical device applications. In the presented paper, first principles calculations have been performed to study...
متن کاملEffect of the Environment on a-Al2O3 (0001) Surface Structures
We report that calculating the Gibbs free energy of the a-Al2O3 (0001) surfaces in equilibrium with a realistic environment containing both oxygen and hydrogen species is essential for obtaining theoretical predictions consistent with experimental observations. Using density-functional theory we find that even under conditions of high oxygen partial pressure the metal-terminated surface is surp...
متن کاملElectronic structure and bonding at the Al–terminated Al(111)/ –Al2O3(0001) interface: A first principles study
We have performed ab initio calculations to determine the bonding character of the Al–terminated Al(111)/ –Al2O3(0001) interface. By using an optimized model in which all atomic coordinates were relaxed to their minimum energy positions, we have determined that Al–O bonds constitute the primary interfacial bonding interaction. Our electron localization, Mayer bond order, and Mulliken population...
متن کاملInfluence of Interface Structure on Schottky Barrier Heights of \alpha-Al_{2}O_{3}(0001)/Ni(111) interfaces: A First-Principles Study
The Schottky barrier heights (SBH) for -Al2O3(0001)/Ni(111) interfaces have been examined using the first-principles pseudopotential method, and compared with our previous results of Al2O3(0001)/Cu(111) interfaces. Configurations with different rigid-body translations parallel to the interface for both the O-terminated and Al-terminated interfaces are examined to clarify the influence of the mi...
متن کامل