Growth, characterization and reactivity studies : oxide films, metal-oxide films and layered oxide films /
This work presents studies of the growth, characterization and reactivity of oxide thin films, metal-oxide films and layered oxide films under vacuum conditions. The growth mode of the films, the geometric, electronic and chemical properties of overlayers and supports as well as the thermal stabili...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=736584081&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | This work presents studies of the growth, characterization and reactivity of oxide thin films, metal-oxide films and layered oxide films under vacuum conditions. The growth mode of the films, the geometric, electronic and chemical properties of overlayers and supports as well as the thermal stability of the overlayers were studied using the techniques and methodology of surface science. These model studies provide a convenient approach to understanding oxide surfaces and interfaces on the atomic scale. Epitaxial titanium oxide and calcium oxide films were synthesized on a refractory substrate, Mo(100), by vapor deposition of metals in the presence of an oxygen background and characterized by various surface analytical techniques. The 90 A thick titanium oxide film is stoichiometric. LEED and STM results show a ([ ])R45' reconstruction of the T'02(ool) film upon annealing. CaO films grow stoichiometrically on the Mo(100) with (100) orientation. The interfacial reactions between oxide thin films and refractory metal substrates were investigated. The thermal stability of an oxide overlayer is found to be mainly dependent upon the heat of formation and film thicknesses of the oxide. The growth mode, electronic and chemical properties of Au clusters supported on the T'02(001)/Mo(loo) surface were studied to understand the catalytic properties of Au supported catalysts. The bonding of Au on TiO2/Mo(100) is weak and Au clusters easily agglomerate upon annealing. Finally, layered binary thin-film oxides of NiO, MgO and CaO were studied as models to understand how the lattice constant mismatch influences the growth, thermal stability and chemical properties of the layered oxides. The influence of MgO and CaO on the NO adsorption on NiO was also studied and correlated to the growth mode of the mixed oxides. |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xv, 167 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 158-166. |