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Hybrid CdSe Nanoparticle–Carbazole Dendron Boxes: Electropolymerization and Energy‐Transfer Mechanism Shift
Author(s) -
Park Yushin,
Taranekar Prasad,
Park Jin Young,
Baba Akira,
Fulghum Timothy,
Ponnapati Ramakrishna,
Advincula Rigoberto C.
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701201
Subject(s) - carbazole , materials science , nanoparticle , dendrimer , quenching (fluorescence) , photochemistry , acceptor , fluorescence , förster resonance energy transfer , quantum dot , absorbance , nanotechnology , polymer chemistry , chemistry , optics , physics , condensed matter physics , chromatography
Abstract Carbazole containing ligand dendrons are designed based on second generation polybenzyl ether dendrons (2GPO). This is subsequently used for directly synthesizing and capping CdSe nanoparticles in contrast to ligand exchange for introducing functionality. The stable hybrid CdSe‐2GPO quantum dot nanoparticles have characteristic energy‐transfer properties from the donor carbazole peripheral groups to the acceptor CdSe nanoparticles, i.e., overlap of the fluorescence of the carbazole with the absorbance of the CdSe nanoparticle resulting in an enhanced fluorescence with concentration through Förster resonance energy transfer (FRET). However, electropolymerization of the peripheral electroactive carbazole units result in a red‐shift in absorbance and quenching in fluorescence. This is attributed to a reversed molecular orbital energy order with respect to the electropolymerized carbazole dendron and CdSe nanoparticle. The hole‐transfer results in fluoresence quenching and charge transfer between the CdSe nanoparticles and the polycarbazole peripheral units. The photoelectric alteration may yet provide for an interesting electro‐optical or sensing device application based on electrochemical properties of the hybrid material.