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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.
Sprache
Englisch
Identifikatoren
ISSN: 0897-4756
eISSN: 1520-5002
DOI: 10.1021/cm050928w
Titel-ID: cdi_crossref_primary_10_1021_cm050928w
Format
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