Details

Autor(en) / Beteiligte

• Umek, Polona
• Cevc, Pavel
• Jesih, Adolf
• Gloter, Alexandre
• Ewels, Christopher P
• Arčon, Denis

Titel

Impact of Structure and Morphology on Gas Adsorption of Titanate-Based Nanotubes and Nanoribbons

Ist Teil von

• Chemistry of materials, 2005-11, Vol.17 (24), p.5945-5950

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report on the synthesis of titania-based nanotubes and nanoribbons prepared by hydrothermal methods, as well as evaluating their structure and adsorption properties. Nanotubes were found to be hollow scrolls with a typical outer diameter of about 10 nm, inner diameter 4−5 nm and length of several hundred nm. The nanoribbons are highly crystalline, typically 40 nm in cross-section and up to a few μm in length. All these samples were exposed to a NO2 atmosphere in order to test their adsorption properties using electron paramagnetic resonance (EPR). The nanotubes were found to have high active surface areas of about 250 m2/g. When exposed to NO2 gas, NO2 molecules tend to physisorb on the nanotube surface via the nonbonding p y orbital of the oxygen atoms. In contrast nanoribbons have much smaller active surface areas (∼30 m2/g). The dominant EPR signal now comes from NO molecules adsorbed on Na+ ions. These results show that titania-based nanotubes and nanoribbons may represent an attractive option for the removal and catalysis of nitrogen oxides in future.