Résumé
Chromophore are encapsulated into host single-walled carbon nanotubes to create hybrid nano-systems with tunable optical and electronic properties. The interplay between the confined molecules and the host nanotube is a key factor1,2.From Raman spectroscopy and G-band shift measurements, a significant charge transfer from the confined dye to the nanotube is evidenced. A photo-activated electron transfer is also inferred for small diameter (~9 Å) semiconducting and metallic tubes.3 The key parameters that govern the charge transfer are the nanotube diameter and the electron donor or acceptor character of the molecules. The resonance Raman intensities of the confined molecules are strongly affected by applying an external pressure.4Furthermore, photoluminescence intensities of nanotubes are either significantly enhanced or quenched depending on the electron donor or acceptor character of the molecules.5 Indeed, the electron (hole) transfer up (down)-shifts the Fermi level of the nanotubes, modulating the radiative de-excitation efficiency.Therefore, molecule confinement into nanotubes is an interesting strategy for the engineering of new opto-electronic devices.[1] L. Alvarez et al, J. Phys. Chem. C, 119, (2015), 5203−5210[2] Y. Almadori et al, J. Phys. Chem. C; 118, (2014), 19462−19468[3] Y. Almadori et al, Carbon 149, (2019), pp. 772-780 [4] R.S. Alencar et al, Carbon 173 (2021) 163-173[5] R. Chambard et al, Carbon, 186, (2022), 423-430