3 years ago

Anisotropic Polymer Nanoparticles with Tunable Emission Wavelengths by Intersegmental Chain Packing

Anisotropic Polymer Nanoparticles with Tunable Emission Wavelengths by Intersegmental Chain Packing
Stefan Mecking, Julian D. Ruiz Perez
The shape of nanoparticles is decisive for their self-assembly properties, as well as for the behavior of individual particles in many instances. The introduction and control of anisotropy is well-known for inorganic nanocrystals but a largely unresolved problem for polymer nanoparticles, especially for conjugated polymers. Here, we report a reproducible preparation method using heterophase polymerization for a range of stable dispersions of ellipsoidal conjugated polymer nanoparticles with sizes in the range of 50 to 180 nm and narrow size and shape distributions. The nanoparticles show a bright fluorescence with tunable emission wavelengths and quantum yields as high as ϕ=78 %. Structural investigations reveal the nanoparticles to be composed of a highly ordered β- and α′-phase within a nematic matrix. Preliminary studies on the origin of particle anisotropy suggest a concerted mechanism in which anisotropic shape evolves from intersegmental packing that occurs along with progressing chain formation by polymerization. Polymer nanoparticles: A range of stable dispersions of ellipsoidal conjugated polymer nanoparticles (CPNs) with sizes from 50 to 180 nm and narrow size and shape distributions were obtained by a reproducible preparation method using heterophase polymerization. The nanoparticles show a bright fluorescence with tunable emission wavelengths and quantum yields as high as ϕ=78 %.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201701000

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