Control of Energy Transfer to CdTe Nanowires via Conjugated Polymer Orientation

Lee, Jaebeom; Kim, Hyong Jun; Chen, Ting; Lee, Kangwon; Kim, Ki Sub; Glotzer, Sharon C.; Kim, Dong Ha; Kotov, Nicholas A.

doi:10.1021/jp807065a

Cited by 27 publications

(14 citation statements)

References 74 publications

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“…Ozone is a good candidate for this purpose because it is inert with the graphene basal plane. [211,212] Fig. 4.21 and 4.22 shows measurements of the electrical reponse of the graphene basal plane and GGBs to ozone generated by UV exposure under an O2 environment.…”

Section: Manipulation Of Ggbs With Functional Groups 4261 Chemicalmentioning

confidence: 99%

Charge and Spin Transport in Disordered Graphene-Based Materials

Tuan

2016

Springer Theses

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Section: Manipulation Of Ggbs With Functional Groups 4261 Chemicalmentioning

confidence: 99%

Charge and Spin Transport in Disordered Graphene-Based Materials

Tuan

2016

Springer Theses

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“…Typically, the above PL quenching for QD counterpart being observed in numerous QD-dye nanocomposites is commonly interpreted as being due to the photoinduced charge transfer (CT) (23,(119)(120)(121)(122)(123)(124) and/or to the dipole-dipole resonant energy transfer of Foerster type (FRET) QD→dye (18,19,22,45,68,72,74,92,100,101,112,(125)(126)(127)(128)(129)(130)(131). Usually in the FRET case, the direct verification of the energy transfer process as a real reason of PL quenching is the comparison of the experimental values of FRET efficiencies via the donor (QD) PL quenching and the sensitization of the acceptor (porphyrin) fluorescence.…”

Section: Spectral-kinetic Manifestation Of Qd-porphyrin Nanoassembliementioning

confidence: 99%

Surface Photochemistry of Quantum Dot-Porphyrin Nanoassemblies for Singlet Oxygen Generation

Zenkevich

Borczyskowski

2015

ACS Symposium Series

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This Chapter covers the basics of nanotechnology, focusing on hybrid organic-inorganic nanoassemblies based on self-assembly principles. Here, we are willing to discuss the formation principles and mechanisms of excitation energy relaxation being studied for nanoassemblies based on core/shell CdSe(ZnS) colloidal semiconductor quantum dots (QD) exhibiting size-dependent photophysical properties and surfacely activated by pyridyl-substituted porphyrins, H 2 P (bulk solutions) in liquid solvents at 295 K (steady-state, picosecond time-resolved luminescence spectroscopy and single molecule spectroscopy). Upon formation of QD-H 2 P nanoassemblies the QD photoluminescence (PL) is quenched as can be detected both via single particle detection and ensemble experiments in solution. PL quenching has been quantitatively assigned to FRET QD→ H 2 P (10-14%) and Non-FRET (86-90%) processes. Using near-IR photoluminescence measurements, we performed a quantitative comparative studying the efficiencies of the singlet oxygen generation by alone QDs and "QD-H 2 P" nanoassemblies upon variation of the laser pulse energy. It was found that for QD-H 2 P nanoassemblies the experimental efficiencies of singlet oxygen generation are essentially higher with respect to those obtained for alone QDs. In the case of QD-H 2 P nanoassemblies, it was proven also that the non-linear dependence of the efficiency of singlet oxygen generation on the laser pulse energy is caused by non-radiative intraband Auger processes, realized in QD counterpart. It has been found that values of FRET QD→ H 2 P efficiencies obtained via direct measurements of IR-emission of singlet oxygen at low laser excitation (Φ IR = 0.12 ± 0.03) are in a good agreement with the corresponding FRET efficiencies found from the direct sensitization data for porphyrin fluorescence (Φ FRET = 0.14 ± 0.02) in nanoassemblies. Such quantitative analysis was done for the first time and shows that namely FRET process QD→H 2 P is a main reason of singlet oxygen generation by QD→H 2 P nanoassemblies.

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“…Firstly, the electrostatic interaction between polymer and CdTe NCs can effectively stabilize the NCs, which avoids the FRET between NCs [45][46][47]. Secondly, there is no FRET between the polymer and CdTe NCs, which ensures the integration of the properties of CdTe NCs and polymer [48,49]. White-light emission materials prepared using NCs are often unstable.…”

Section: Controllable Regulation Of the Emitted Colormentioning

confidence: 99%

An effective method to prepare polymer/nanocrystal composites with tunable emission over the whole visible light range

et al. 2010

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Materials with emission over the whole visible range (400-800 nm) have been obtained through incorporating single-colored CdTe nanocrystals (NCs) into a poly(p-phenylene vinylene) (PPV) precursor [the sulfonium polyelectrolyte precursor of PPV]. Firstly, the quantum yield (QY) of the PPV precursor was improved to ~50% via heat treatment of a mixed solution of the PPV precursor and poly(vinyl alcohol) (PVA) at 100 °C for 3 min. Then, single-colored CdTe NCs were incorporated into the mixed solution. The introduction of the PVA was necessary to reduce the electrostatic interaction between the PPV precursor and CdTe NCs, which improved their compatibility. The reduced electrostatic interaction eliminated Förster resonance energy transfer (FRET) processes between NCs, as well as between NCs and the PPV precursor, which allowed the functional integration of the polymer and NCs. Consequently, polymer/NC composites with almost any Commission Internationale de L'Eclairage (CIE) coordinates can be achieved by simply changing the size and amount of the NCs. In particular, when the emission wavelength of the CdTe NCs was 559 nm, a pure white-light emitting material with CIE coordinates (0.337, 0.332) was obtained.

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Control of Energy Transfer to CdTe Nanowires via Conjugated Polymer Orientation

Cited by 27 publications

References 74 publications

Charge and Spin Transport in Disordered Graphene-Based Materials

Charge and Spin Transport in Disordered Graphene-Based Materials

Surface Photochemistry of Quantum Dot-Porphyrin Nanoassemblies for Singlet Oxygen Generation

An effective method to prepare polymer/nanocrystal composites with tunable emission over the whole visible light range

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