| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
International Symposium on Defects, Transport and Related Phenomena
|
| Presentation Title |
Optical In-Situ Spectroscopy of Titania Thin Films |
| Author(s) |
Jianmin Shi, Doh-Kwon Lee, Han-Ill Yoo, Jürgen Janek, Klaus-Dieter Becker |
| On-Site Speaker (Planned) |
Jianmin Shi |
| Abstract Scope |
Titanium dioxide, TiO<SUB>2</SUB>, is one of the most promising photocatalysts for applications in environmental protection and renewable energies. In order to improve the photocatalytic efficiency, defect engineering of TiO<SUB>2</SUB> via reduction and/or anion doping has attracted much attention in recent years. Reduced and nitrogen-doped titanium dioxide thin films exhibit a large electronic absorbance in the visible and NIR region. Oxidation experiments of the oxygen deficient TiO<SUB>2</SUB> thin films in atmospheres of pure oxygen or nitrogen at high temperatures were performed and monitored by optical in-situ spectroscopy. The oxidation kinetics can be analyzed using a parabolic rate law yielding an activation energy of 1.96 eV. The re-oxidation kinetics and the blue shift of the band gap of nitrogen-doped thin films observed during the oxidation processes are discussed in the framework of a microscopic oxidation model and in relation to the release of nitrogen from the thin films, respectively. |
| Proceedings Inclusion? |
Undecided |