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Carla Bittencourt: TXM-NEXAFS of Sodium Titanate Nanostructures

Abstract

Low dimensional TiO2-based materials have been successfully synthesized. These novel nanostructures bring to reality the possibility for fine tuning of chemical reactivity, as the system structure and the occupation of the outermost energy levels can be controllably tuned by changing preparation parameters. In this work, electronic properties of individual (Na,H)xTi3O7 nanoribbons (NR) (fig.1) prepared through hydrothermal treatment of anatase TiO2 were studied using TXM-NEXAFS at beamline U41-FSGM at BESSY II, Berlin [1]. Reference samples (TiO2 anatase and rutile, SrTiO3) were used as models for the interpretation of the spectroscopic signatures. Ti L2,3-edges were recorded in two experimental geometries: Ē parallel and perpendicular to the principal axis of the nanostructure (Fig.2). This structure results from transitions to final state that are sensitive to deviations from Ti Oh symmetry [2]. The absence of splitting of eg states suggests will be discussed in terms of the crystal field splitting, and the hybridization between the transition metal and the ligand anions.

[1] S. Heim, P. Guttmann, S. Rehbein, S. Werner, G. Schneider, Journal of Physics: Conference Series 186, 012041 (2009) [2] J. P. Crocombette, J. Phys.: Condens. Matter 6, 10811 (1994).

Keywords

NEXAFS, TXM, Sodium Titanate, nanoribbons

Administrative data

Presenting author: Carla Bittencourt
Organisation: EMAT, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium

co-authors:

X. Ke (1), G. Van Tendeloo (1), P. Umek (2), D. Arcon2, P. Guttmann (3) 1 EMAT, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium 2 Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia 3 Helmholtz-Zentrum für Materialien und Energie, Dep. Microscopy, Albert-Einstein-Str. 15, 12489 Berlin, Germany

Type: Poster (portrait)

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