Nanoparticles of Conjugated Polymers

Pecher, Jacques; Mecking, Stefan

doi:10.1021/cr100132y

Cited by 677 publications

(671 citation statements)

References 229 publications

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“…1b) with quantum yields from 11-35% (see Table 1). This is comparable with conjugated polymer particles produced by other methods 20 , indicating that the relatively high level of palladium catalyst does not impair the optical properties of the conjugated polymer particles prepared by our new method. Clearly the fluorescence of these colloids can be tuned from blue to deep red, as shown by the corresponding spectra in Fig.…”

Section: Resultssupporting

confidence: 84%

“…The total conversion of these dispersion polymerizations is consistently around 55%, and moderate molecular weights for P1, P2 and P4 are found between 13 and 17.5 kDa with polydispersities (M n /M w ) of the polymers between 2.5 and 5 (see Table 1). These values for conversion and molecular weight are among the highest reported for conjugated polymer particles, prepared by a direct synthetic procedure 20 .…”

Section: Resultsmentioning

confidence: 61%

“…Although semiconducting polymer particles of polypyrrole 13 , polyaniline 14 and polythiophene 15 have been synthesized via oxidation in a dispersion polymerization, colloidal particles of light-emitting conjugated polymers have only been prepared by postpolymerization miniemulsification 16 , reprecipitation 17 or emulsion polymerization using metal-catalysed cross-coupling reactions 18,19 . However, these methods lead to high polydispersities 20 , inhibiting crystallization of the colloids, thus making them unsuitable for creating self-assembled periodic structures, such as photonic crystals. Direct synthetic methods to produce large quantities of monodisperse light-emitting conjugated polymer particles remain unexplored to date.…”

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confidence: 99%

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Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

2012

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The self-assembly of colloidal building blocks into complex and hierarchical structures offers a versatile and powerful toolbox for the creation of new photonic and optoelectronic materials. However, well-defined and monodisperse colloids of semiconducting polymers, which would form excellent building blocks for such self-assembled materials, are not readily available. Here we report the first demonstration of a suzuki-miyaura dispersion polymerization; this method produces highly monodisperse submicrometer particles of a variety of semiconducting polymers. moreover, we show that these monodisperse particles readily self-assemble into photonic crystals that exhibit a pronounced photonic stopgap.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 61%

mentioning

confidence: 99%

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Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

2012

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“…Indeed, nanoparticles based on conjugated polymers are emerging as multifunctional nanoscale materials that promise great potentials. [27][28][29][30][31][32][33] Here we report that the use of Rozen's reagent, one of the most powerful oxygen transfer agents, [8][9][10][11] allows for the preparation of poly(3-hexylthiophene-S,S-dioxide) nanoparticles, whose properties can be skillfully tuned through the controlled introduction of TDO moieties before or after the formation of poly(3-hexylthiophene) nanoparticles. The different modalities of introduction of TDO moieties causes the formation of either PTDO-NPs obtained from pre-oxygenated P3HT, with dimensions down to 5 nm, or core-shell P3HT@PTDO-NPs obtained from oxygenation of the surface of preformed P3HT nanoparticles.…”

mentioning

confidence: 99%

Poly(3-hexylthiophene) Nanoparticles Containing Thiophene-S,S-dioxide: Tuning of Dimensions, Optical and Redox Properties, and Charge Separation under Illumination

et al. 2017

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We describe the preparation of poly(3-hexylthiophene-S,S-dioxide) nanoparticles using Rozen's reagent, HOF•CH 3 CN, either on poly(3-hexylthiophene) (P3HT) or on preformed P3HT nanoparticles (P3HT-NPs). In the latter case, core−shell nanoparticles (P3HT@PTDO-NPs) are formed, as confirmed by X-ray photoelectron spectroscopy measurements, indicating the presence of oxygen on the outer shell. The different preparation modalities lead to a finetuning of the chemical−physical properties of the nanoparticles. We show that absorption and photoluminescence features, electrochemical properties, size, and stability of colloidal solutions can be finely modulated by controlling the amount of oxygen present. Atomic force microscopy measurements on the nanoparticles obtained by a nanoprecipitation method from preoxidized P3HT (PTDO-NPs) display spherical morphology and dimensions down to 5 nm. Finally, Kelvin probe measurements show that the coexistence of p-and n-type charge carriers in all types of oxygenated nanoparticles makes them capable of generating and separating charge under illumination. Furthermore, in core−shell nanoparticles, the nanosegregation of the two materials, in different regions of the nanoparticles, allows a more efficient charge separation.

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“…Polymer nanoparticles (PNPs) are newly developed optical nanomaterials that have attracted widespread attention because they have large extinction coefficients, exceptional fluorescence brightness, excellent photostability, and good biocompatibility 12. Owing to these properties, PNPs have potential uses in the field of biosensors,13 bioimaging,14 and phototherapy 15.…”

Section: Introductionmentioning

confidence: 99%

Single Near‐Infrared Emissive Polymer Nanoparticles as Versatile Phototheranostics

et al. 2017

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Attaining consistently high performance of diagnostic and therapeutic functions in one single nanoplatform is of great significance for nanomedicine. This study demonstrates the use of donor–acceptor (D–A) structured polymer (TBT) to develop a smart “all‐five‐in‐one” theranostic that conveniently integrates fluorescence/photoacoustic/thermal imaging and photodynamic/photothermal therapy into single nanoparticle. The prepared nanoparticles (TBTPNPs) exhibit near‐infrared emission, high water solubility, excellent light resistance, good pH stability, and negligible toxicity. Additionally, the TBTPNPs exhibit an excellent singlet oxygen (1O2) quantum yield (40%) and high photothermal conversion efficiency (37.1%) under single‐laser irradiation (635 nm). Apart from their two phototherapeutic modalities, fluorescence, photoacoustic signals, and thermal imaging in vivo can be simultaneously achieved because of their enhanced permeability and retention effects. This work demonstrates that the prepared TBTPNPs are “all‐five‐in‐one” phototheranostic agents that can exhibit properties to satisfy the “one‐fits‐all” requirement for future phototheranostic applications. Thus, the prepared TBTPNPs can provide fundamental insights into the development of PNP‐based nanoagents for cancer therapy.

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Nanoparticles of Conjugated Polymers

Cited by 677 publications

References 229 publications

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization

Poly(3-hexylthiophene) Nanoparticles Containing Thiophene-S,S-dioxide: Tuning of Dimensions, Optical and Redox Properties, and Charge Separation under Illumination

Single Near‐Infrared Emissive Polymer Nanoparticles as Versatile Phototheranostics

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