BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Synthesis and properties of Co-doped titanate nanotubes and their optical sensitization with methylene blue

Participants in the publication
Ferreira, Virginia C (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
A.J. Silvestre (Author)
M.R. Nunes (Author)
O.C. Monteiro (Author)
CQB

Summary
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.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
MATERIALS CHEMISTRY AND PHYSICS

Publication Identifiers
ISSN - 0254-0584



Document Identifiers
URL - http://dx.doi.org/10.1016/j.matchemphys.2013.07.029.
DOI - https://doi.org/10.1016/j.matchemphys.2013.07.029

Rankings
SCOPUS Q1 (2012) - 0.916 - General Materials Science

Keywords
Nanostructures Optical properties Surface properties Semiconductors

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