The optoelectronic processes occurring in colloidal anatase TiO2 nanocrystals/MEH-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-PPV/TiO2 nanorods hetero-junctions and higher photoactivity of as prepared blends compared to the single components was observed and explained.
TiO2 Nanocrystals - MEH-PPV Composite Thin Films as Photoactive Material
COZZOLI, Pantaleo Davide;
2004-01-01
Abstract
The optoelectronic processes occurring in colloidal anatase TiO2 nanocrystals/MEH-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-PPV/TiO2 nanorods hetero-junctions and higher photoactivity of as prepared blends compared to the single components was observed and explained.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
