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Bittencourt, C., Krueger, P., Lagos, M. J., Ke, X., Van Tendeloo, G., Ewels, C., Umek, P. & Guttmann, P. (2012) Towards atomic resolution in sodium titanate nanotubes using near-edge X-ray-absorption fine-structure spectromicroscopy combined with multichannel multiple-scattering calculations. Beilstein J. Nanotechnol. 3 789–797.
Added by: Laurent Cournède (2016-03-10 21:28:38) |
| Type de référence: Article DOI: 10.3762/bjnano.3.88 Numéro d'identification (ISBN etc.): 2190-4286 Clé BibTeX: Bittencourt2012 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: anatase, EELS, electronic-structure, energy-loss spectroscopy, lithium, microscope, morphology, multichannel multiple scattering, nanotubes, nexafs, sodium titanates, surfaces, tio2, titanium-dioxide Créateurs: Bittencourt, Ewels, Guttmann, Ke, Krueger, Lagos, Umek, Van Tendeloo Collection: Beilstein J. Nanotechnol. |
Consultations : 1/596
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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Recent advances in near-edge X-ray-absorption fine-structure spectroscopy coupled with transmission X-ray microscopy (NEXAFS-TXM) allow large-area mapping investigations of individual nano-objects with spectral resolution up to E/Delta E = 104 and spatial resolution approaching 10 nm. While the state-of-the-art spatial resolution of X-ray microscopy is limited by nanostructuring process constrains of the objective zone plate, we show here that it is possible to overcome this through close coupling with high-level theoretical modelling. Taking the example of isolated bundles of hydrothermally prepared sodium titanate nanotubes ((Na,H)TiNTs) we are able to unravel the complex nanoscale structure from the NEXAFS-TXM data using multichannel multiple-scattering calculations, to the extent of being able to associate specific spectral features in the O K-edge and Ti L-edge with oxygen atoms in distinct sites within the lattice. These can even be distinguished from the contribution of different hydroxyl groups to the electronic structure of the (Na,H)TiNTs.
Added by: Laurent Cournède |