Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
A. Riss, T. Berger, H. Grothe, J. Bernardi, O. Diwald, E. Knözinger:
"Chemical Control of photoexcited States in Titanate Nanostructures";
Vortrag: Bunsentagung 2007,
Graz;
17.05.2007
- 19.05.2007; in: "106. Bunsentagung, Heterogene Neuartige Kohlenstoffstrukturen",
(2007),
S. C16.
Kurzfassung englisch:
Abstract:
The photoelectronic properties of layered titanate nanostructures can be adjusted by changing the nature and bonding state of ions in the interlayer region. We studied the optical properties of titanate nanowires and nanotubes obtained after soft-chemical treatment of TiO2 anatase powders. A photoluminescence emission process originating from exciton states trapped in [TiO6] units was observed in anatase TiO2 and, with significantly enhanced intensity, in nanowires made of titanate nanosheets. On the basis of a correlation between emission intensity and the concentration of intercalated alkali ions, we conclude that protonation of the [TiO6] octahedra that constitute the titanate sheet structure suppresses radiative deactivation of trapped excitons and can be reversed by ion exchange.
"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1021/nl062699y
Zugeordnete Projekte:
Projektleitung Oliver Diwald:
Ladungstrennung an Titandioxid-Nanokrist
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.