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Peng, C.-W., Richard-Plouet, M., Ke, T.-Y., Lee, C.-Y., Chiu, H.-T., Marhic, C., Puzenat, E., Lemoigno, F. & Brohan, L. (2008) Chimie Douce Route to Sodium Hydroxo Titanate Nanowires with Modulated Structure and Conversion to Highly Photoactive Titanium Dioxides. Chem. Mat. 20 7228–7236.
Added by: Laurent Cournède (2016-03-10 21:58:40) |
| Type de référence: Article DOI: 10.1021/cm8007039 Numéro d'identification (ISBN etc.): 0897-4756 Clé BibTeX: Peng2008 Voir tous les détails bibliographiques  |
Catégories: CESES Mots-clés: electron-diffraction, features, metals, nanofibers, nanotubes, naoh, reactivity, tio2, x-ray Créateurs: Brohan, Chiu, Ke, Lee, Lemoigno, Marhic, Peng, Puzenat, Richard-Plouet Collection: Chem. Mat. |
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| Résumé |
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{Sodium hydroxo titanate nanowires with NaTi(2)O(4)(OH) formulation are fabricated by chimie-douce from TiO(2) powders in a hot concentrated base solution. In the present work, we investigate, in detail, the structure and morphology of the titanate, acid-exchanged materials, and phases formed during dehydration of these compounds; we then discuss the relationship between the initial titanate structure and TiO(2) formation. XRD, ED, HRTEM, EDS, density measurements, and TG/MS results suggest that the titanate and acid-exchanged structures were closely related to the pseudolepidocrocite arrangement ("Cs(2)Ti(6)O(12)" type). The average structure of NaTi(2)O(4)(OH) nanowires consists of noncorrugated Ti(2)O(3)(OH) and NaO layers stacked along the [0 10] direction and an energy minimization was further conducted by theoretical methods. From TEM study, we demonstrated that NaTi(2)O(4)(OH) exhibits a modulated structure (q wave vector equals to 1/7 [001]*), which originates from the misfit between the NaO and Ti(2)O(3)(OH) sublattices. NaTi(2)O(4)(OH) structure has a monoclinic distortion (I2/m space group) with refined unit cell a = 0.37000(6) nm
Added by: Laurent Cournède |