Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3811
Título: Synthesis and properties of Co-doped titanate nanotubes and their optical sensitization with methylene blue
Autor: Ferreira, V. C.
Nunes, M. R.
Silvestre, A. J.
Monteiro, O. C.
Palavras-chave: Nanostructures
Optical properties
Surface properties
Semiconductors
Data: 15-Out-2013
Editora: Elsevier Science SA
Citação: FERREIRA, V. C.; NUNES, M. R.; SILVESTRE, A. J.; MONTEIRO, O. C. - Synthesis and properties of Co-doped titanate nanotubes and their optical sensitization with methylene blue. Materials Chemistry and Physics. Vol. 142, nr. 1 (2013), p. 355-362.
Resumo: Here we report on a novel chemical route to synthesize homogenous cobalt-doped titanate nanotubes (CoTNT), using an amorphous Co-doped precursor. The influence of the synthesis temperature, autoclave dwell time and metal doping on the structural and microstructural as well as on the optical properties of the synthesized titanate nanotubes is studied and discussed. The optical band gaps of the CoTNT samples are red shifted in comparison with the values determined for the undoped samples, such red shifts bringing the absorption edge of the CoTNT samples into the visible region. CoTNT materials also demonstrate particular high adsorption ability for methylene blue, the amount of the adsorbed dye being higher than the one predictable for a monolayer formation. This suggests the possibility of intercalation of the dye molecule between the TiO6 layers of the TNT structure. It is also shown that the methylene blue sensitized Co-doped nanostructures are highly stable under UV radiation and present a strong and broad absorption in the visible region. (C) 2013 Elsevier B.V. All rights reserved.
Descrição: Agência Financiadora - Fundação para a Ciência e Tecnologia - PTDC/CTM NAN/113021/2009
Peer review: yes
URI: http://hdl.handle.net/10400.21/3811
DOI: 10.1016/j.matchemphys.2013.07.029
ISSN: 0254-0584
Versão do Editor: http://arxiv.org/ftp/arxiv/papers/1308/1308.5652.pdf
Aparece nas colecções:ISEL - Física - Artigos



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