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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Alves, W. [1] ; Ribeiro, A. O. [1] ; Pinheiro, M. V. B. [2] ; Krarnbrock, K. [2] ; El Haber, F. [3] ; Froyer, G. [3] ; Chauvet, O. [3] ; Ando, R. A. [4] ; Souza, F. L. [1] ; Alves, W. A. [1]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[2] Univ Fed Minas Gerais, ICEx, Dept Fis, BR-31270901 Belo Horizonte, MG - Brazil
[3] Univ Nantes, CNRS, Inst Mat Rouxel IMN, F-44322 Nantes 03 - France
[4] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Physical Chemistry C; v. 115, n. 24, p. 12082-12089, JUN 23 2011.
Citações Web of Science: 4
Resumo

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. (AU)

Processo FAPESP: 08/53576-9 - Síntese, caracterização e estudo das propriedades eletrônicas dos nanotubos de peptídeos e óxido de titânio
Beneficiário:Wendel Andrade Alves
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 08/57805-2 - Instituto de Bioanalítica
Beneficiário:Lauro Tatsuo Kubota
Linha de fomento: Auxílio à Pesquisa - Temático