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Transmission electron microscopy of annealed titanate nanotubes for catalytic applications (CROSBI ID 596393)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Milivoj Plodinec, Miran Čeh, Andreja Gajović Transmission electron microscopy of annealed titanate nanotubes for catalytic applications. 2012

Podaci o odgovornosti

Milivoj Plodinec, Miran Čeh, Andreja Gajović

engleski

Transmission electron microscopy of annealed titanate nanotubes for catalytic applications

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 . 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-sensitized solar cells ; the photo-catalytic degradation of environmental contaminants ; gas- and liquid-phase catalysis, function in solid-state lithium batteries, and biosensors. With the aim to increase photo-catalytic properties of titanate base nanotubes, we studied the influence of the temperature treatment of H2Ti3O7 in various atmospheres on morphology, phase transition and light absorption. Titanate nanotubes (TiNT-H) were prepared by hydrothermal treatment of TiO2 powder with NaOH and subsequent ion exchange by HCl, and then calcined on several temperatures. Temperature treatments were performed in high temperature Astro furnace. Changes in morphology and catalytic properties were studied by TEM, HRTEM, Raman spectroscopy, XRD, BET surfaces analysis, and UV/Vis/NIR spectroscopy. 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 a complete degradation of tubular structure and the formation of elongated nanocrystals, nanorods or nanowires depending of the annealing atmosphere were observed. The typical morphology of elongated nanocrystals with well-defined crystal lattice and average size 10 – 20 nm. This study demonstrates that thermal treatment of TiNT–H nanotubes in selected atmospheres 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.

Titania nanotubes; Functionalization; Photocatalysis

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Podaci o prilogu

2012.

objavljeno

Podaci o matičnoj publikaciji

Podaci o skupu

2nd Adriatic School on Nanoscience

poster

02.09.2012-07.09.2012

Dubrovnik, Hrvatska

Povezanost rada

Fizika