ANYL 113 |
| Fluorescent nanoparticles have attracted much attention due to a variety of applications such as fluorescence biosensing, imaging and high throughout assays. Pi-conjugated polymers are a class of highly fluorescent materials with large absorptivity and high quantum yield. For the biological applications such as in vivo sensing and imaging, the nanoparticles must be soluble, stable, and sufficiently bright in aqueous dispersions. A simple method has been recently developed for obtaining fluorescent nanoparticles of hydrophobic conjugated polymers that are well dispersed in water. However, in comparison with the polymers in tetrahydrofuran solutions, the resulting nanoparticles suffered from a reduction in fluorescence intensity due to the enhanced interchain interactions originated from polymer collapse. Here we demonstrate that this problem can be circumvented by doping with an energy acceptor. Polyfluorene (PFO) nanoparticles doped with PFPV or MEH-PPV, respectively, were prepared by the reprecipitation method. The emission of the blended nanoparticles can be tuned by varying the type of dopant and the dopant concentration. For those with 6% dopant concentrations, the fluorescence from PFO (donor) was completely quenched, while the dopant emission exhibited high fluorescence quantum yield and notable lack of aggregate features. |
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General Session
7:00 PM-9:00 PM, Sunday, 26 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster
Sci-Mix
Division of Analytical Chemistry |