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Quenching of Photoactivity in Phthalocyanine Copper(II) -Titanate Nanotube Hybrid Systems

2011; American Chemical Society; Volume: 115; Issue: 24 Linguagem: Inglês

10.1021/jp202101r

1932-7455

Wendel A. Alves, Anderson Orzari Ribeiro, M. V. B. Pinheiro, Klaus Krambrock, Fady El Haber, G. Froyer, O. Chauvet, Rômulo A. Ando, Flávio L. Souza, Wendel A. Alves,

Polyoxometalates: Synthesis and Applications

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(II) (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.