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.
| Original language | English |
|---|---|
| Pages (from-to) | 2071-2078 |
| Number of pages | 8 |
| Journal | Advanced Functional Materials |
| Volume | 18 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2008 Jul 23 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Condensed Matter Physics
- Electrochemistry
Cite this
Hybrid CdSe nanoparticle-carbazole dendron boxes : Electropolymerization and energy-transfer mechanism shift. / Park, Yushin; Taranekar, Prasad; Park, Jin Young; Baba, Akira; Fulghum, Timothy; Ponnapati, Ramakrishna; Advincula, Rigoberto C.
In: Advanced Functional Materials, Vol. 18, No. 14, 23.07.2008, p. 2071-2078.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hybrid CdSe nanoparticle-carbazole dendron boxes
T2 - Electropolymerization and energy-transfer mechanism shift
AU - Park, Yushin
AU - Taranekar, Prasad
AU - Park, Jin Young
AU - Baba, Akira
AU - Fulghum, Timothy
AU - Ponnapati, Ramakrishna
AU - Advincula, Rigoberto C.
PY - 2008/7/23
Y1 - 2008/7/23
N2 - 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.
AB - 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.
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U2 - 10.1002/adfm.200701201
DO - 10.1002/adfm.200701201
M3 - Article
VL - 18
SP - 2071
EP - 2078
JO - Advanced Materials for Optics and Electronics
JF - Advanced Materials for Optics and Electronics
SN - 1057-9257
IS - 14
ER -