Naslov
Self-organization of nanoparticles in TiO2 thin film on the glass substrate

Autori
Dubček, Pavo ; Turković, Aleksandra ; Fox, Nikola Dean

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
10th joint vacuum conference, 11th meeting of Slovenian and Croatian vacuum scientists, 24th Slovenian vacuum symposium, program and book of abstracts, September 28-October 2, 2004, Portorož, Slovenia / Mozetič, Miran ; Šetina, Janez ; Kovač, Janez - Ljubljana : Infokart, 2004, 68-68

Skup
10th joint vacuum conference, 11th meeting of Slovenian and Croatian vacuum scientists, 24th Slovenian vacuum symposium

Mjesto i datum
Portorož, Slovenija, 28.09.2004. - 02.10.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Titanium dioxide; nanoparticles; self-organization; GIWAXD

Sažetak
Nanocrystalline titanium dioxide colloids have been synthesized using a sol-gel technique followed by growth under hydrothermal conditions in a basic environment at temperatures between 190o and 270o C. Thin films have been made from aqueous suspension of these colloids. Grazing-incidence X-ray scattering diffraction (GIWAXD) analysis showed the films to be primarily the anatase crystal phase. It is in agreement with previous scanning electron microscopy (SEM) results, which had revealed a predominantly rod like particle morphology after growth at lower temperatures. The formation of principally truncated tetragonal or tetrahedral bipyramidal nanocrystallites followed growth at higher temperatures. The rod like particles self-organize into regular cubic arrays with the long axis of the rods aligned perpendicular to the film surface. This self -organization is dependent upon the base used in colloidal synthesis. In this work we have performed GIWAXD experiment at synchrotron ELETTRA in Trieste, Italy. The two-theta angle was changed from 5 to 35 degrees with parallel change of rocking-angle for 4 degrees. Focused on anatase line at 25 degrees we have followed its behaviour upon change of rocking-angle. In basic "ordered" TiO2 film intensity of this line has changed and thus showed (101) orientation plane parallel to substrate as dominant. This plane is connected with tetragonal and bipyramidal particles that have primarily (101) surfaces, as observed previously for anatase nanocrystallites. In transparent "acidic" films the preferential (412) plane was dominant.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA