Polyfluorene Nanoparticles and Quantum Dot Hybrids via Miniemulsion Polymerization

Abstract

Suzuki-Miyam~polycondensatlbn of 2-(4A,5;5-tetramethyI-lJ3,2-dioxaborolan-2-yl)-7-broino~9,9-dioctylfluor~ ene in aqueous miniemulsion With only tw'oequivalents of NaOH as~ base yields colloidally stable nanoparticles of polyfluorene With M;, ca. 2 X lQ4 g mol-1 and particle sizes of 40-85 nrn,depending on the surfactant concentration. Polymerization in the presen<:e of CdSe/CdS core/shell quantum dots affords hybrid nanoparticles of nonaggregated qllantum dots, in particular nanoparticles composed of a single quantllm dot embedded in a polyfluorene shell. Microphotolurninescence $pectros.copy on single hybrid. particles reveals an enhanced photostability of the quantllm dots and indicates an etIkient Forster energy transfer from the polyfluorene shell to the quantum dot.

Low Bandgap Semiconducting Copolymer Nanoparticles by Suzuki Cross‐Coupling Polymerization in Alcoholic Dispersed Media

“…The stable dispersion obtained with a lower amount of base is in agreement with what Mecking and co‐workers showed, as one equivalent of base was still sufficient for an efficient catalysis in the miniemulsion polymerization of bifunctional fluorene, going against the mechanistic theories that maintain the need of two equivalents of base. The amount of base has also an impact on the dispersity.…”

Intramolecular charge-transfer emission from conjugated polymer nanoparticles: the terminal group effect on electronic and optical properties

“…[5][6][7][8][9][10][11][12] However, compared with typical QDs, the post-functionalization of CPNs is difficult because most of them consist of linear conjugated polymers without functional groups. [5][6][7][8][9][10][11][12] However, compared with typical QDs, the post-functionalization of CPNs is difficult because most of them consist of linear conjugated polymers without functional groups.…”

Correlation between Optical Properties and Nanomorphology of Fluoranthene-Based Conjugated Copolymer

“…8,12,15,16 On the other hand, phenyl-substituted fluoranthene unit provides rigidity and crystallinity in the molecular structure. 17,18 The charge carrier mobility in polymeric semiconductors depends on the π-orbital overlap along the conjugated backbone which improves with the planarity and rigidity of the repeating unit.…”