Title :
Contribution of Surface Defects to Cathodoluminescence Emission Spectra of Nanocrystalline Titanium Dioxide
Author_Institution :
National Inst. of Microtechnology, IMT-Bucharest, Bucharest
Abstract :
Cathodoluminescence study of titanium dioxide nanocrystalline powders shows that a strong contribution arises in the visible range from emission bands associated with surface defects. The authors have found that oxygen-vacancy defects are created at the surface of the TiO 2 nanocrystallites during a reduction process carried out in hydrogen atmosphere at 800 degC. The emission band associated with this defect is situated at a wavelength of 480 nm
Keywords :
cathodoluminescence; nanostructured materials; noncrystalline defects; powders; reduction (chemical); titanium compounds; vacancies (crystal); visible spectra; 480 nm; 800 C; TiO2; cathodoluminescence emission spectra; nanocrystalline powders; oxygen-vacancy defects; surface defects; titanium dioxide; Annealing; Argon; Atmosphere; Crystallization; Hydrogen; Optical surface waves; Powders; Scanning electron microscopy; Titanium; Transmission electron microscopy;
Conference_Titel :
International Semiconductor Conference, 2006
Conference_Location :
Sinaia
Print_ISBN :
1-4244-0109-7
DOI :
10.1109/SMICND.2006.283936
