Alves, W., Ribeiro, A. O., Pinheiro, M. V. B., Krarnbrock, K., El Haber, F., Froyer, G., Chauvet, O., Ando, R. A., Souza, F. L. & Alves, W. A. (2011) Quenching of Photoactivity in Phthalocyanine Copper(II)-Titanate Nanotube Hybrid Systems. J. Phys. Chem. C, 115 12082–12089.
Added by: Laurent Cournède (2016-03-10 21:32:20)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1932-7447
Clé BibTeX: Alves2011
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Mots-clés: doped tio2 nanotubes, electronic-structure, hydroxyl, nanoparticles, one-dimensional nanostructures, photocatalytic activity, ray photoelectron-spectroscopy, superoxide, titanate nanotubes, visible-light
Créateurs: Alves, Alves, Ando, Chauvet, El Haber, Froyer, Krarnbrock, Pinheiro, Ribeiro, Souza
Collection: J. Phys. Chem. C
Consultations : 3/921
Indice de consultation : 5%
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Titanate nanotubes (TiNTs) were obtained by hydrothermal treatment of anatase powder in aqueous NaOH solution and then modified with 2,9,16,23-tertracarboxyl phthalocyanine copper(H) (CuPc). This hybrid organic inorganic nanoscopic system was characterized by X-ray diffraction, microscopy, and spectroscopy. Transmission electron microscopy (TEM) images of pure and modified TiNTs revealed multiwall structures with an average outer diameter of 9 nm and a length of several hundred nanometers. The tubular morphology of the TiNTs was covered with CuPc-film. The amount of CuPc adsorbed onto the TiNTs was quantified by electron paramagnetic resonance (EPR). Using the same technique and spin-trapping methodology, the photogeneration of reactive oxygen species (ROS) from the TiNTs was systematically investigated. A drastic quenching of photoactivity was observed in the CuPc/TiNT hybrid system. Electron transfer from excited CuPc states to the TiNT conduction band followed by electron recombination may be the cause of this quenching.
Added by: Laurent Cournède