Home  About us  Contact
 

Metal Oxide Surfaces (metal + oxide_surface)

Distribution by Scientific Domains
Physics and Astronomy50%

Selected Abstracts

Silicon-Assisted Direct Covalent Grafting on Metal Oxide Surfaces: Synthesis and Characterization of Carboxylate N,N,-Ligands on TiO2

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 11 2010
Henri Arzoumanian
Abstract The easy covalent bonding of an OH-bearing molecule onto a metal oxide surface can be done by transesterifying a trimethylsilylated hydroxy function with the surface OH groups. This results in the grafting of the organic molecule directly on the matrix, accompanied by the formation of trimethylsilanol, which can easily be eliminated as volatile hexamethyldisiloxane and water. This was accomplished on a TiO2 matrix with three carboxylic acids: acetic, isonicotinic, and 2,2,-bipyridyl-4,4,-dicarboxylic acids. The N,N,-immobilized ligand was then used for a dioxidomolybdenum entity and tested as such at room temperature and under atmospheric pressure O2 oxidation of ethylbenzene. All intermediates and grafted species were fully characterized by 13CMAS NMR spectroscopy, and thermogravimetric and elemental analysis. [source]

Retarded surface photovoltage response from dye molecules adsorbed on metal oxide surfaces

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 11 2004
Th. DittrichArticle first published online: 11 AUG 200
Abstract A retarded surface photovoltage response has been observed on metal oxide layers (SnO2:F, TiO2) covered with adsorbed dye molecules while only the dye molecules were excited by short laser pulses. The retardation ranged between 30 and 570 ns depending on the nature of the metal oxide and on surface treatment. Therefore, charge separation in space of electrons injected from dye molecules into metal oxides is strikingly different from ultrafast electron injection measured by time-resolved optical techniques. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Molecular and biomolecular interfaces to metal oxide semiconductors

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2010
Robert J. Hamers
Abstract Previous work has shown that organic alkenes will graft to covalent semiconductors such as diamond and silicon. Here, we demonstrate that organic alkenes can be grafted to the surfaces of metal oxide semiconductors, including TiO2 in nanocrystalline thin films and as single-crystal anatase(001) epitaxial films grown on SrTiO3(001) substrates. The resulting layers can be used as a starting point for linking biomolecules such as DNA to metal oxide surfaces. Initial results are presented showing that this chemistry can also be applied to graft molecular layers to zirconium oxide thin films. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]