Spectroscopic evidence for the bulk polymerization of N-vinyl carbazole in the presence of single-walled carbon nanotubes
Mihaela Baibarac, Ioan Baltog, Serge Lefrant, Pedro Gomez-Romero
Polymer, Volume 48, Issue 18, 24 August 2007, Pages 5279-5288
The bulk polymerization reaction of N-vinylcarbazole (VK) at 70 °C in the presence of single-walled carbon nanotubes (SWNTs) leads to a new composite, whose optical properties were studied by photoluminescence (PL), surface enhanced Raman scattering (SERS) and Fourier transform infrared (FTIR) spectroscopies. A dramatic reduction of the poly(N-vinylcarbazole) (PVK) PL efficiency and a change in the vibrational structure of the PL spectrum of this polymer were observed by adding SWNTs to the synthesis mixture. Steric hindrance effects were evidenced both in SERS spectra of the VK when it interacts mechanico-chemically with SWNTs and in FTIR spectra of the un-doped PVK/SWNTs' composites. Cyclic voltammetry was used to demonstrate the doping process of PVK in PVK/SWNTs' composite.
PL spectra of compounds obtained by bulk polymerization of VK (0.5 g) in absence (curve 1) and presence of different amounts of SWNTs: 0.01 g (curve 2), 0.025 g (curve 3), 0.05 g (curve 4) and 0.1 g (curve 5).