Raman Spectra in Vanadate Nanotubes Revisited

In this letter we report the Raman spectra of vanadate nanotubes (VONTs). The spectra present a clear signature that can be used for probing the tubular structure. The temperature effects on the structure of dodecylamine- and Cu-intercalated VONTs were studied by changing the laser power density dur...

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Bibliographic Details
Published in:Nano letters 2004-11, Vol.4 (11), p.2099-2104
Main Authors: Souza Filho, A. G, Ferreira, O. P, Santos, E. J. G, Mendes Filho, J, Alves, O. L
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
Infrared and raman spectra and scattering
Materials science
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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Summary:In this letter we report the Raman spectra of vanadate nanotubes (VONTs). The spectra present a clear signature that can be used for probing the tubular structure. The temperature effects on the structure of dodecylamine- and Cu-intercalated VONTs were studied by changing the laser power density during the Raman measurements. We have found that low laser power densities promote the decomposition of VONTs, leading to the collapse of the tubular structure and converting the nanotubes into V2O5 oxide. The decomposition occurs through an intermediate compound that is isostructural to V2O5 xerogel. The Raman experiments in VONT-based systems should be performed at extremely low laser power densities.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl0488477