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Isothermal Encapsulation of a-sexithiophene in Single-Walled Carbon Nanotubes

Gaufrès, Etienne (CNRS-Onera, Châtillon, FRA); Tang, Nathalie, Y-W (RQMP and Département de Chimie, Université de Montréal, Montréal, CAN); Favron, Alexandre (RQMP and département de Physique, Université de Montréal, Montréal, CAN); Allard, Charlotte (RQPM and département Génie Physique, Ecole Polytechnique, Montréal, CAN); Izard, Nicolas (Laboratoire Charles Coulomb Université de Montpellier, Montpellier, FRA); Tahir, Saïd (Laboratoire Charles Coulomb Université de Montpellier, Montpellier, FRA); Jourdain, Vincent (Laboratoire Charles Coulomb Université de Montpellier, Montpellier, FRA); Martel, Richard (RQMP and Département de Chimie, Université de Montréal, Montréal, CAN)

Here, we capitalize on the giant Raman scattering effect from 1D aggregated dye molecules [1] to probe the encapsulation process of molecules into carbon nanotubes. The isothermal encapsulation is followed at 30°C and 115°C by Raman spectroscopy and hyperspectral Raman imaging. The analysis of the isotherms shape coupled to the encapsulation profile imaging of long SWCNT allow us to highlight the filling and filling and asembling scenario of α-sexithiophene (6T) into SWCNT with diameters of 1.35±0.2 nm. [2] The Raman experimental data are fitted using both a Langmuir (type VI) and Ising isotherm models. We show that 6Ts encapsulate from the nanotube ends and assemble spontaneously as single-aggregates, then as pair-aggregates with a formation enthalpy of ΔHpair = -260±20 meV per molecule.

[1] Giant Raman scattering from J-aggregated dyes inside carbon nanotubes for multispectral imaging. E. Gaufrès, N Y-W Tang, R. Martel et al. Nature Photonics (2014)

 

[2]Isothermal Encapsulation of α-sexithiophene in Single-Walled Carbon Nanotubes E. Gaufrès, N Y-W Tang, R. Martel et al. (submitted)

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