Controlling photophysical properties of ultrasmall conjugated polymer nanoparticles through polymer chain packing

Nature Communications
Hubert PiwońskiSatoshi Habuchi

Abstract

Applications of conjugated polymer nanoparticles (Pdots) for imaging and sensing depend on their size, fluorescence brightness and intraparticle energy transfer. The molecular design of conjugated polymers (CPs) has been the main focus of the development of Pdots. Here we demonstrate that proper control of the physical interactions between the chains is as critical as the molecular design. The unique design of twisted CPs and fine-tuning of the reprecipitation conditions allow us to fabricate ultrasmall (3.0-4.5 nm) Pdots with excellent photostability. Extensive photophysical and structural characterization reveals the essential role played by the packing of the polymer chains in the particles in the intraparticle spatial alignment of the emitting sites, which regulate the fluorescence brightness and the intraparticle energy migration efficiency. Our findings enhance understanding of the relationship between chain interactions and the photophysical properties of CP nanomaterials, providing a framework for designing and fabricating functional Pdots for imaging applications.

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Citations

Dec 28, 2017·Angewandte Chemie·Jaesung YangLaura J Kaufman
Jun 14, 2018·Photochemistry and Photobiology·Liang GuoPengfei Wang
Jan 16, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Thais Fedatto AbelhaLea Ann Dailey
Sep 15, 2019·Analytica Chimica Acta·Naader AlizadehFatemeh Rabbani
Oct 24, 2018·Analytical Chemistry·Herman CoceancighTakashi Ito
Nov 13, 2020·The Journal of Physical Chemistry. B·Paul D HarrisSatoshi Habuchi

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Methods Mentioned

BETA
fluorescence microscopy
atomic force microscopy
dynamic light scattering
fluorescence spectroscopy
electron microscopy
electron diffraction
nuclear magnetic resonance
fluorescence imaging
fluorescence
electron

Software Mentioned

FluoFit
SymPhoTime64
PicoQuant

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