Author/Authors :
Sلfar، نويسنده , , G.A.M. and Ribeiro، نويسنده , , H.B. and Malard، نويسنده , , L.M. and Plentz، نويسنده , , F.O. and Fantini، نويسنده , , C. and Santos، نويسنده , , A.P. and de Freitas-Silva، نويسنده , , G. and Idemori، نويسنده , , Y.M.، نويسنده ,
Abstract :
Porphyrin-doped carbon nanotubes in sodium dodecylbenzenesulfonate (NaDDBS) aqueous solution were obtained from NaDDBS/carbon nanotube aqueous dispersions. Several phonon-assisted absorption and recombination processes seem to occur, including one-phonon and two-phonon processes, and remain present even upon porphyrin doping. Power-law scaling of exciton binding energies and environmental dielectric screening effects are used to infer the doping from photoluminescence maps. The dielectric constant of the 5,10,15,20-tetrakis(4-trimethylammonium phenyl) porphyrin (H2TTMAPP) in NaDDBS aqueous solution seems to be higher than the one of NaDDBS/aqueous solution apparently because the counterions have opposite net charges.
