Publikation: Anisotropic Polymer Nanoparticles with Tunable Emission Wavelengths by Intersegmental Chain Packing
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Angewandte Chemie International Edition. 2017, 56(22), pp. 6147-6151. ISSN 0570-0833. eISSN 1521-3773. Available under: doi: 10.1002/anie.201701000
Zusammenfassung
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.
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RUIZ PEREZ, Julian Dominik, Stefan MECKING, 2017. Anisotropic Polymer Nanoparticles with Tunable Emission Wavelengths by Intersegmental Chain Packing. In: Angewandte Chemie International Edition. 2017, 56(22), pp. 6147-6151. ISSN 0570-0833. eISSN 1521-3773. Available under: doi: 10.1002/anie.201701000BibTex
@article{RuizPerez2017-05-22Aniso-39108,
year={2017},
doi={10.1002/anie.201701000},
title={Anisotropic Polymer Nanoparticles with Tunable Emission Wavelengths by Intersegmental Chain Packing},
number={22},
volume={56},
issn={0570-0833},
journal={Angewandte Chemie International Edition},
pages={6147--6151},
author={Ruiz Perez, Julian Dominik and Mecking, Stefan}
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<dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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