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Optical and vibrational studies on single walled carbon nanotubes/short oligo‐para‐methoxy‐toluene composite
Author(s) -
Said A. Haj,
Ayachi S.,
Chefia I.,
Wéry J.,
Alimi K.
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34287
Subject(s) - luminescence , materials science , nanocomposite , raman spectroscopy , carbon nanotube , oligomer , excited state , quenching (fluorescence) , photochemistry , absorption (acoustics) , raman scattering , stacking , chemical engineering , polymer chemistry , nanotechnology , chemistry , composite material , fluorescence , optics , optoelectronics , organic chemistry , physics , engineering , nuclear physics
In a solution state, an oligophenylene prepared by electrochemical oxidation of para ‐methoxy‐toluene exhibited luminescence in the violet‐to‐blue region. However, in a solid state, a clear red shift was observed as a signature of a supramolecular π‐stacking interaction between oligomer chains. In a de‐doped state, by chemical reduction, a fine structure in the form of two peaks was observed and luminescence intensity was strongly improved. When mixed with single walled carbon nanotubes (SWNTs), a quenching in the luminescence intensity accompanied by a slight blue shift of the PL peak of the nanocomposite was observed. This implies the shortening of the oligomer's effective π‐conjugation length caused by the added amount of SWNTs. A charge transfer in the photo‐excited state was also noted. The interaction taking place between the two materials was supported by optical infrared absorption and Raman scattering measurements and then a functionalizing mechanism was proposed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011