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Structure of the Hydrated -Al2O3 (0001) Surface

Journal Article · · Science
 [1];  [2];  [3];  [4];  [5];  [5];  [5]
  1. Univ. of Chicago, IL (United States); The University of Chicago
  2. Stanford Univ., CA (United States)
  3. Stanford Univ., CA (United States); Stanford Synchrotron Radiation Lightsource, Stanford, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of Chicago, IL (United States)
The physical and chemical properties of the hydrated α-Al2O3 (0001) surface are important for understanding the reactivity of natural and synthetic aluminum-containing oxides. The structure of this surface was determined in the presence of water vapor at 300 kelvin by crystal truncation rod diffraction at a third-generation synchrotron x-ray source. The fully hydrated surface is oxygen terminated, with a 53% contracted double Al layer directly below. The structure is an intermediate between α-Al2O3 and γ-Al(OH)3, a fully hydroxylated form of alumina. A semiordered oxygen layer about 2.3 angstroms above the terminal oxygen layer is interpreted as adsorbed water. The clean α-Al2O3 (0001) surface, in contrast, is Al terminated and significantly relaxed relative to the bulk structure. These differences explain the different reactivities of the clean and hydroxylated surfaces.
Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-94ER14466
OSTI ID:
1508033
Report Number(s):
DOE-UCHICAGO--14466-3
Journal Information:
Science, Journal Name: Science Journal Issue: 5468 Vol. 288; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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Electronic interactions and charge transfers of metal atoms and clusters on oxide surfaces journal January 2013
Comparative DFT study of inner-sphere As(iii) complexes on hydrated α-Fe2O3(0001) surface models journal January 2012
Naturally occurring iron oxide nanoparticles: morphology, surface chemistry and environmental stability journal January 2013
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Oxygen adsorption onto pure and doped Al surfaces – the role of surface dopants journal January 2015
Toward the rational design of non-precious transition metal oxides for oxygen electrocatalysis journal January 2015
Morphology-dependent interplay of reduction behaviors, oxygen vacancies and hydroxyl reactivity of CeO 2 nanocrystals journal January 2015
The atomistic origin of interface confinement and enhanced conversion efficiency in Si nanowire solar cells journal January 2016
Phase dependent thermal and spectroscopic responses of Al 2 O 3 nanostructures with different morphogenesis journal January 2015
Molecular structure of octadecylphosphonic acids during their self-assembly on α-Al 2 O 3 (0001) journal January 2018
The stability of the hydroxylated (0001) surface of α-Al2O3 journal June 2003
Vibrational spectra of dissociatively adsorbed D 2 O on Al-terminated α-Al 2 O 3 (0001) surfaces from ab initio molecular dynamics journal June 2019
Pt 8 cluster on alumina under a pressure of hydrogen: Support-dependent reconstruction from first-principles global optimization journal November 2019
Probing equilibrium of molecular and deprotonated water on TiO 2 (110) journal February 2017
Human Health Risk Assessment for Aluminium, Aluminium Oxide, and Aluminium Hydroxide journal November 2007
Polarity of oxide surfaces and nanostructures journal December 2007
X-ray truncation rod analysis of the reversible temperature-dependent [001] surface structure of LaAlO3 journal November 2001
Adhesion, atomic structure, and bonding at the Al ( 111 ) / α − Al 2 O 3 ( 0001 ) interface: A first principles study journal February 2002
Layer intermixing during metal/metal oxide adsorption: Ti/sapphire(0001) journal September 2002
Direct Identification of Dilute Surface Spins on Al 2 O 3 : Origin of Flux Noise in Quantum Circuits journal January 2017
Unveiling the influence of interfacial bonding and dynamics on solid/liquid interfacial structures: An ab initio molecular dynamics study of (0001) sapphire-liquid Al interfaces journal February 2020
Optimizing a flow-through X-ray transmission cell for studies of temporal and spatial variations of ion distributions at mineral–water interfaces journal November 2012
Microwave Plasma Synthesis of Nanostructured γ-Al 2 O 3 Powders journal September 2003
Hydroxylation of the surface of PbS nanocrystals passivated with oleic acid journal May 2014
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Zinc and Cadmium Adsorption to Aluminum Oxide Nanoparticles Affected by Naturally Occurring Ligands journal March 2014
Heterogeneous chemistry of monocarboxylic acids on α-Al 2 O 3 at different relative humidities journal January 2010

Figures / Tables (3)


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