Photophysical comparative study of amylose and polyvinyle pyrrolidone/single walled carbon nanotubes complex.
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 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.
Institut des Matériaux Jean Rouxel, UMR6502, Université de Nantes-CNRS, 2 rue de la Houssinière, 44322 Nantes cedex 3, France. pierre.m.bonnet@univ-bpclermont.fr
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D000688:Amylose / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010777:Photochemistry; D011205:Povidone / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry
D037742:Nanotubes, Carbon; D013501:Surface-Active Agents; D000688:Amylose; D011205:Povidone