Optical and Vibrational Studies on Single Walled Carbon Nanotubes/Short Oligo-Para-Methoxy-Toluene Composite

作者：Said A Haj; Ayachi S; Chefia I; Wery J; Alimi K^*

来源：Journal of Applied Polymer Science, 2011, 122(3): 1889-1897.

DOI：10.1002/app.34287

• carbon nanotube
• composites
• infrared spectroscopy
• pi-stacking
• photoluminescence

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 pi-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 pi-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.

• 出版日期2011-11-5