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Bonnet, P., Buisson, J. P., Martyr, N. N., Bizot, H., Buelon, A. & Chauvet, O. (2009) Photophysical comparative study of amylose and polyvinyle pyrrolidone/single walled carbon nanotubes complex. Phys. Chem. Chem. Phys. 11 8626–8631.
Added by: Laurent Cournède (2016-03-10 21:41:25) |
| Type de référence: Article DOI: 10.1039/b907948c Numéro d'identification (ISBN etc.): 1463-9076 Clé BibTeX: Bonnet2009 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: Composites, dependence, energies, solubilization Créateurs: Bizot, Bonnet, Buelon, Buisson, Chauvet, Martyr Collection: Phys. Chem. Chem. Phys. |
Consultations : 1/570
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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Progressive addition of hydroxypropylated amylose (AmH), from 0.05 wt\% to 4.5 wt\%, to single-walled carbon nanotubes (SWNTs) in aqueous surfactant suspensions quenches the intrinsic near Infra-Red fluorescence of semiconducting SWNTs while dispersions obtained with a same amount of polyvinylpyrrolidone (PVP) remain luminescent. Near Infra-Red emission spectroscopy (fluorescence and Raman scattering) of the samples is used to characterize the supramolecular organization of these polymer/SWNT complexes. The SWNTs are found to be wrapped by the PVP chains and not by the AmH chains which rather form AmH/surfactant/SWNTs complexes. In PVP/SWNTs dispersion, the. uorescence line position and intensity are affected by dielectric screening. In the case of AmH/surfactant/SWNTs complex, dielectric screening plays also a role but quenching occurs above about 3 wt\% of AmH. We attribute the quenching to the formation of a "composite like'' microstructure by opposition to stabilized dispersion.
Added by: Laurent Cournède |