Naslov
High-temperature hydrogenation of pure and silverdecorated titanate nanotubes to increase their solar absorbance for photocatalytic applications

Autori
Plodinec, Milivoj ; Gajović, Andreja ; Jakša, Gregor ; Žagar, Kristina, Čeh, Miran

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

Izvornik
Workshop on characterization of semiconductor nanostructures ; the role of defects / Capan, Ivana, Slunjski Robert - Zagreb : Institut Ruđer Bošković, 2013, 32-32

Skup
Workshop on characterization of semiconductor nanostructures ; the role of defects

Mjesto i datum
Zagreb, Hrvatska, 02.04.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
nanostructured oxide materials; chemical synthesis; photo-catalysis; TEM; X-ray diffraction

Sažetak
Titanate (TiNT) and TiO2 nanotubes are a new mesoporous nanostructured materials based on titanium dioxide attract huge interest in the last few years due to their attractive properties [1]. The properties include: the ease of synthesis with a relatively low cost (especially in comparison to the carbon nanotubes), a high specific surface area, ability to functionalize the surface via chemisorptions or the ion-exchange of species, and the possibility of reversible gas adsorption. Current application areas of titanium oxide nanostructures include: dye-sensitised solar cells ; the photo-catalytic degradation of environmental contaminants ; gas- and liquid-phase catalysis, function in solid-state lithium batteries, and biosensors [1]. We studied how the temperature treatment of H2Ti3O7 in reduce atmosphere influenced on morphology, phase transition and photo-catalytic properties of titania nanotubes. Titanate nanotubes (TiNT-H) were prepared by hydrothermal treatment of commercially P25 powder and then calcined on several temperature. Temperature treatment were performed in high temperature Astro furnace. Changes in morphology and properties were studied by TEM, HRTEM, Raman spectroscopy, XRD, UV/Vis/NIR spectroscopy, BET srfaces analysis. Before thermal treatment TiNT – H show tubular morphology with high specific surface area of about 400 m2/g, inner diameter of 7-9 nm and outer diameter 9 – 12 nm, and average length from 300 nm up to 1 μm. After thermal treatment sample show a complete degradation of tubular structure to mostly elongated nanocrystals with well-defined crystal lattice and average size 10 – 20 nm. Raman spectra demonstrated that during thermal treatment occurred phase transition from trititanate H2Ti3O7 crystal structure to partly disordered tetragonal crystal structure of a TiO2 anatase. This study demonstrates that thermal treatment of TiNT–H nanotubes in reductive atmosphere significantly influenced on crystal structure and light absorption of TiO2 nanostructures in visible and IR region. High activity in visible and IR region obtained powder could increase photocatalytic properties of titania nanotubes.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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