Optical study of porphyrin-doped carbon nanotubes

Enhanced field emission from cerium hexaboride coated multiwalled carbon nanotube composite films: A potential material for next generation electron sources

“…19 The effect of surrounding material on the transition energies was experimentally confirmed by photoluminescence (PL) results of SWCNTs immersed in organic solvents with dielectric constants up to 37, 20 and SWCNTs non-covalently functionalized by porphyrins. 21,22 On the other hand, it was proposed that doping and charge transfer may play the main role in the changes of electronic structure of SWCNTs. According to Safar et al 23 the G band position is indicative of charge transfer but the intensity of the 2D band in SWCNTs is more sensitive to the slope of the electronic energy dispersion than the G band.…”

Stability of singlet and triplet trions in carbon nanotubes

“…Characterisation of doped CNTs is important as a stepping stone towards electronics based on CNTs. Optical characterisations of CNTs have been carried out by a number of groups [8][9][10]. Previously, the importance of including excitons in calculations of the optical response for CNTs was shown in [11], where it was concluded that the exciton binding energy in some cases shifts the energy peak with up to 40%.…”

Iron and Cobalt Corroles in Solution and on Carbon Nanotubes as Molecular Photocatalysts for Hydrogen Production by Water Reduction

“…The UV/Vis signals of corroles adsorbed on the nanotube surface are considerably broadened and redshifted (Δ λ ≈12 nm), which clearly indicates the formation of a conjugated corrole–MWNT with a strong π–π interaction (Figure S10 in the Supporting Information) . Moreover, after sonication of the MWNT solutions, the absorbance spectra show a maximum at 264 nm, which is also redshifted (Δ λ ≈30 nm) after the modification.…”

“…The UV/Vis signals of corroles adsorbed on the nanotube surfacea re considerably broadened and redshifted (Dl % 12 nm), which clearlyindicates the formation of aconjugated corrole-MWNT with as trong p-p interaction ( Figure S10 in the Supporting Information). [40,[42][43][44] Moreover,a fter sonication of the MWNTsolutions, the absorbance spectra show am aximum at 264 nm, [45][46][47] which is also redshifted (Dl % 30 nm) after the modification. The shift observed is direct evidence of the p-p interaction between the nanotube sidewall and the corrole ring in the nanocomposite dispersion.…”