Artículo
Bilmes, S.A.; Mandelbaum, P.; Alvarez, F.; Victoria, N.M. "Surface and electronic structure of titanium dioxide photocatalysts" (2000) Journal of Physical Chemistry B. 104(42):9851-9858
Consulte la política de Acceso Abierto del editor
Abstract:
TiO 2 films prepared by sol-gel route are active photocatalysts for the oxidation of organics in photoelectrochemical cells. The as-grown films for photocatalysis applications and those exposed to Ar + or H 2 + +Ar + ion bombardment are characterized by different spectroscopic methods, such as X-ray diffraction (XRD), atomic force microscopy (AFM), UV-vis transmittance, photothermal deflection spectroscopy (PDS) and X-ray photoelectron spectroscopy (XPS), as well as by conductance. This material has defects associated with oxygen vacancies produced during the sample preparation which support nondissociative adsorption of O 2 when films are exposed to air. Charge transfer from reduced Ti species to adsorbed dioxygen leads to Ti-O 2 - surface complexes that are partially removed by heating at 200 °C, and fully removed after 30 min ion bombardment. By comparison with the relatively well-understood structural defects of bombarded TiO 2 we arise to a quite complete structural model of the as grown material which corresponds to an amorphous semiconductor possessing relative low disorder and density of states as compared with a pure amorphous material. These TiO 2 films are modeled as low size crystalline domain embedded in an amorphous matrix whose electronic structure exhibit exponential band tails and a narrow band close to the conduction band. The latter is fully or partially occupied depending on the presence of adsorbed electron scavengers such as dioxygen. © 2000 American Chemical Society.
Registro:
| Documento: | Artículo |
| Título: | Surface and electronic structure of titanium dioxide photocatalysts |
| Autor: | Bilmes, S.A.; Mandelbaum, P.; Alvarez, F.; Victoria, N.M. |
| Filiación: | INQUIMAE-Departamento de Quimica Inorganica, Analitica y Quimica-fisica, Facultad de Ciencias Exactas y Naturelles, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas Unicamp, 13083-970 Campinas, São Paulo, Brazil |
| Palabras clave: | Amorphous materials; Atomic force microscopy; Catalysts; Charge transfer; Electronic structure; Gas adsorption; Ion bombardment; Optical films; Photoelectrochemical cells; Sol-gels; Surface structure; X ray diffraction analysis; Nondissociative adsorption; Photocatalysts; Photothermal deflection spectroscopy (PDS); Titanium dioxide |
| Año: | 2000 |
| Volumen: | 104 |
| Número: | 42 |
| Página de inicio: | 9851 |
| Página de fin: | 9858 |
| Título revista: | Journal of Physical Chemistry B |
| Título revista abreviado: | J. Phys. Chem. B |
| ISSN: | 15206106 |
| CODEN: | JPCBF |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v104_n42_p9851_Bilmes |
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Citas:
---------- APA ----------
Bilmes, S.A., Mandelbaum, P., Alvarez, F. & Victoria, N.M. (2000) . Surface and electronic structure of titanium dioxide photocatalysts. Journal of Physical Chemistry B, 104(42), 9851-9858.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v104_n42_p9851_Bilmes [ ]
---------- CHICAGO ----------
Bilmes, S.A., Mandelbaum, P., Alvarez, F., Victoria, N.M. "Surface and electronic structure of titanium dioxide photocatalysts" . Journal of Physical Chemistry B 104, no. 42 (2000) : 9851-9858.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v104_n42_p9851_Bilmes [ ]
---------- MLA ----------
Bilmes, S.A., Mandelbaum, P., Alvarez, F., Victoria, N.M. "Surface and electronic structure of titanium dioxide photocatalysts" . Journal of Physical Chemistry B, vol. 104, no. 42, 2000, pp. 9851-9858.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v104_n42_p9851_Bilmes [ ]
---------- VANCOUVER ----------
Bilmes, S.A., Mandelbaum, P., Alvarez, F., Victoria, N.M. Surface and electronic structure of titanium dioxide photocatalysts. J. Phys. Chem. B. 2000;104(42):9851-9858.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v104_n42_p9851_Bilmes [ ]
