Effect of thermal treatment and ageing on IR transmission and visible photoluminescence of nanostructured aluminum oxyhydroxide

Мова статті: 
Англійська
Автор(и) статті: 
A Yu Karlash , V A Skryshevsky , A N Khodan , A V Kanaev and V Ya Gayvoronsky,
Вихідні данні статті: 
J. Phys. D: Appl. Phys. 45 365108
Назва журналу: 
Journal of Physics D: Applied Physics
Рік публікації: 
2012
Volume: 
45
Issue: 
36
Ключові слова: 
-
Ключове слово: 
-

IR transmission and visible photoluminescence (PL) were studied in raw nanoporous aluminum oxyhydroxide (NOA) and in samples after thermal treatment at different temperatures. Structural and chemical modifications of the NOA sample were related to the water content and adsorption/desorption process at the surface. The differences observed in the FTIR spectra in vacuum and after ageing of the samples can be explained by the effects of molecular water and OH groups on the stability of the low-temperature phases of NOA. A considerable increase in PL intensity and spectrum expansion to longer wavelengths were observed in all NOA samples after water desorption. This was accompanied by strong changes in the PL decay kinetics. Quenching of the fast luminescent decay and low-energy transitions in aged samples were observed after ageing of the samples. Partial passivation of the NOA surface and defective sites under ambient conditions is discussed.

Назва підрозділу: 
Кафедра нанофізики конденсованих середовищ
ІНСТИТУТ ВИСОКИХ ТЕХНОЛОГІЙ Матеріали дозволено використовувати на умовах GNU FDL без незмінюваних секцій та Creative Commons Attribution/Share-Alike
Дизайн: Інститут високих технологій
Ivan Ivanov