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| Hauptseite > Publikationsdatenbank > Citric Acid Based Carbon Dots with Amine Type Stabilizers: pH-Specific Luminescence and Quantum Yield Characteristics > print |
| Hauptseite > Publikationsdatenbank > Citric Acid Based Carbon Dots with Amine Type Stabilizers: pH-Specific Luminescence and Quantum Yield Characteristics > print |
| 001 | 893896 | ||
| 005 | 20220131120348.0 | ||
| 024 | 7 | _ | |a 10.1021/acs.jpcc.9b11732 |2 doi |
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| 100 | 1 | _ | |a Meierhofer, Florian |0 0000-0002-5578-7731 |b 0 |
| 245 | _ | _ | |a Citric Acid Based Carbon Dots with Amine Type Stabilizers: pH-Specific Luminescence and Quantum Yield Characteristics |
| 260 | _ | _ | |a Washington, DC |c 2020 |b Soc. |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a We report the synthesis and spectroscopic characteristics of two different sets of carbon dots (CDs) formed by hydrothermal reaction between citric acid and polyethylenimine (PEI) or 2,3-diaminopyridine (DAP). Although the formation of amide-based species and the presence of citrazinic acid type derivates assumed to be responsible for a blue emission is confirmed for both CDs by elemental analysis, infrared spectroscopy, and mass spectrometry, a higher abundance of sp2-hybridized nitrogen is observed for DAP-based CDs, which causes a red-shift of the n-π* absorption band relative to the one of PEI-based CDs. These CD systems possess high photoluminescence quantum yields (QY) of ∼40% and ∼48% at neutral pH, demonstrating a possible tuning of the optical properties by the amine precursor. pH-Dependent spectroscopic studies revealed a drop in QY to < 9% (pH ∼ 1) and < 21% (pH ∼ 12) for both types of CDs under acidic and basic conditions. In contrast, significant differences in the pH-dependency of the n-π* transitions are found for both CD types which are ascribed to different (de)protonation sequences of the CD-specific fluorophores and functional groups using zeta potential analysis. |
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| 700 | 1 | _ | |a Weigert, Florian |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Dissinger, Frank |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Jungclaus, Jörgen |0 P:(DE-HGF)0 |b 3 |
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| 700 | 1 | _ | |a Waldvogel, Siegfried R. |0 0000-0002-7949-9638 |b 5 |
| 700 | 1 | _ | |a Resch-Genger, Ute |0 0000-0002-0944-1115 |b 6 |e Corresponding author |
| 700 | 1 | _ | |a Voss, Tobias |0 0000-0003-2580-2723 |b 7 |e Corresponding author |
| 773 | _ | _ | |a 10.1021/acs.jpcc.9b11732 |g Vol. 124, no. 16, p. 8894 - 8904 |0 PERI:(DE-600)2256522-X |n 16 |p 8894 - 8904 |t The journal of physical chemistry |v 124 |y 2020 |x 1932-7455 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/893896/files/acs.jpcc.9b11732.pdf |
| 856 | 4 | _ | |y Published on 2020-04-02. Available in OpenAccess from 2021-04-02. |u https://juser.fz-juelich.de/record/893896/files/jp-2019-117324%20_revised_ms%20%28no%20highlights%29%20.pdf |
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