The optoelectronic processes occurring in colloidal anatase TiO2 nanocrystalsyMEH-PPV conjugated polymer blends are reported. Composite films were prepared by spin-coating an homogeneous solution of low molecular weight MEH-PPV and surfactant-capped TiO2 nanocrystals onto low resistivity ITO substrates. Both nearly spherical and rod-like titania nanoparticles were used in the hybrid structures and the resulting blends comparatively examined, as a function of TiO2 nanoparticle morphology. The photoinduced charge transfer and recombination processes at the interface between the two components were studied by steady-state optical spectroscopy and photoelectrochemical experiments. A significant fluorescence quenching of the polymer occurred in MEH-PPVyTiO2 nanorods hetero-junctions and higher photoactivity of as prepared blends compared to the single components was observed and explained. 2003 Elsevier B.V. All rights reserved
TiO2 nanocrystals - MEH-PPV composite thin films as photoactive material / Petrella, A.; Tamborra, M.; Cozzoli, P. D.; Curri, M. L.; Striccoli, M.; Cosma, P.; Farinola, G. M.; Babudri, F.; Naso, F.; Agostiano, A.. - In: THIN SOLID FILMS. - ISSN 0040-6090. - STAMPA. - 451-452:(2004), pp. 64-68. [10.1016/j.tsf.2003.10.106]
TiO2 nanocrystals - MEH-PPV composite thin films as photoactive material
Petrella, A.;
2004-01-01
Abstract
The optoelectronic processes occurring in colloidal anatase TiO2 nanocrystalsyMEH-PPV conjugated polymer blends are reported. Composite films were prepared by spin-coating an homogeneous solution of low molecular weight MEH-PPV and surfactant-capped TiO2 nanocrystals onto low resistivity ITO substrates. Both nearly spherical and rod-like titania nanoparticles were used in the hybrid structures and the resulting blends comparatively examined, as a function of TiO2 nanoparticle morphology. The photoinduced charge transfer and recombination processes at the interface between the two components were studied by steady-state optical spectroscopy and photoelectrochemical experiments. A significant fluorescence quenching of the polymer occurred in MEH-PPVyTiO2 nanorods hetero-junctions and higher photoactivity of as prepared blends compared to the single components was observed and explained. 2003 Elsevier B.V. All rights reservedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
