2026-06-27T12:31:57Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/442172024-09-09T17:33:54Zcom_20.500.14352_14col_20.500.14352_15

Díaz-Guerra Viejo, Carlos Umek, Paloma Gloter, Alexandre Piqueras De Noriega, Francisco Javier 2023-06-20T03:40:29Z 2023-06-20T03:40:29Z 2010-05-13 1932-7447 10.1021/jp1005132 https://hdl.handle.net/20.500.14352/44217 http://dx.doi.org/10.1021/jp1005132 http://pubs.acs.org We report on the synthesis of Cr^(3+)-doped sodium titanate nanotubes and nanoribbons by a hydrothermal method. The presence of dopant ions in these nanostructures was confirmed by high angle annular dark field scanning transmission electron microscopy in combination with electron energy loss spectroscopy measurements. Luminescence properties of undoped and Cr^(3+)-doped sodium titanate nanotubes and nanoribbons were investigated by cathodoluminescence in the scanning electron microscope. A broad visible band in the range 1.7-2.7 eV is observed in these nanostructures. Such emission is similar to that observed in bulk anatase TiO_2 and titanate powders, and is related to TiO_6 octahedra, which is a common feature to all the samples investigated. Near-infrared emission, sometimes attributed to Ti^(3+) interstitials, is observed in bulk powders but is absent in the titanate nanotubes and nanoribbons. Incorporation of Cr^(3+) between the titanate layers of the nanostructures is revealed by the characteristic intraionic emission line at 1.791 eV. Sodium titanate nanoribbons appear to be an effective host for optically active Cr^(3+) ions, as compared with nanotubes or bulk powder. eng restricted access Synthesis and cathodoluminescence of undoped and Cr^(3+)-doped Sodium Titanate nanotubes and nanoribbons journal article