|Conţinutul numărului revistei|
|Ultima descărcare din IBN:|
| SM ISO690:2012|
ENACHI, Mihail; TROFIM, Viorel; TIGHINEANU, Ion; URSACHI, Veaceslav; COSEAC, Valeriu. Characterization of structure and luminescence of titania nanotubes . In: Moldavian Journal of the Physical Sciences. 2009, nr. 2(8), pp. 214-220. ISSN 1810-648X.
|Moldavian Journal of the Physical Sciences|
|Numărul 2(8) / 2009 / ISSN 1810-648X /ISSNe 2537-6365|
The morphology, structural, and optical properties of porous titania layers prepared by
electrochemical oxidation of Ti foils are studied as a function of technological conditions of
preparation and post-electrochemical-oxidation thermal treatment. Ti foils were anodized in
aqueous and non-aqueous HF and H PO solutions by applying various anodizing conditions.
Titania nanotubes with diameters ranging from 30 nm to 250 nm with controlled length have
been prepared. The influence of thermal treatment upon the structural properties of TiO
nanotubes was investigated by means of X-ray diffraction analysis and Raman scattering. It
was found that the as prepared samples are amorphous. As the annealing temperature increases to 300°C, an anatase structure is formed. Starting from 500°C, a rutile structure is produced which coexists with the anatase structure. A complete phase transition to the rutile
structure occurs at 800°C. The luminescence from both anatase and rutile phases was observed at low temperatures. The origin of luminescence bands is discussed.