Photophysical comparative study of amylose and polyvinyle pyrrolidone / single walled carbon nanotubes complex

P. Bonnet (1, 2) , N. Nomède Martyr (1) , H. Bizot (3) , J- P. Buisson (1) , A. Buleon (3) , Olivier Chauvet (1)

1 IMN - Institut des Matériaux Jean Rouxel
2 LMI - Laboratoire des Matériaux Inorganiques
3 BIA - Unité de recherche sur les Biopolymères, Interactions Assemblages

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 complex. The SWNTs are found to be wrapped by the PVP chains and not by the AmH chains which rather form AmH/surfactant/SWNTs complex. In PVP/SWNTs dispersion, the fluorescence 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.

Domaines: Matériaux

P. Bonnet, N. Nomède Martyr, H. Bizot, J- P. Buisson, A. Buleon, et al.. Photophysical comparative study of amylose and polyvinyle pyrrolidone / single walled carbon nanotubes complex. 2009. ⟨hal-00371578v2⟩