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| Home > Publications database > Understanding the role of single molecular ZnS precursors in the synthesis of In(Zn)P/ZnS nanocrystals > print |
| 001 | 185878 | ||
| 005 | 20240610121044.0 | ||
| 024 | 7 | _ | |a 10.1021/am504988j |2 doi |
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| 100 | 1 | _ | |a Kardynal, Beata |0 P:(DE-Juel1)145316 |b 0 |e Corresponding Author |
| 245 | _ | _ | |a Understanding the role of single molecular ZnS precursors in the synthesis of In(Zn)P/ZnS nanocrystals |
| 260 | _ | _ | |a Washington, DC |c 2014 |b Soc. |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1423059101_19681 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a Environmentally friendly nanocrystals (NCs) such as InP are in demand for various applications, such as biomedical labeling, solar cells, sensors, and light-emitting diodes (LEDs). To fulfill their potential applications, the synthesis of such high-quality “green” InP NCs required further improvement so as to achieve better stability, higher brightness NCs, and also to have a more robust synthesis route. The present study addresses our efforts on the synthesis of high-quality In(Zn)P/ZnS core–shell NCs using an air- and moisture-stable ZnS single molecular precursor (SMP) and In(Zn)P cores. The SMP method has recently emerged as a promising route for the surface overcoating of NCs due to its simplicity, high reproducibility, low reaction temperature, and flexibility in controlling the reaction. The synthesis involved heating the In(Zn)P core solution and Zn(S2CNR2) (where R = methyl, ethyl, butyl, or benzyl and referred to as ZDMT, ZDET, ZDBT, or ZDBzT, respectively) in oleylamine (OLA) to 90–250 °C for 0.5–2.5 h. In this work, we systematically studied the influence of different SMP end groups, the complex formation and stability between the SMP and oleylamine (OLA), the reaction temperature, and the amount of SMP on the synthesis of high-quality In(Zn)P/ZnS NCs. We found that thiocarbamate end groups are an important factor contributing to the low-temperature growth of high-quality In(Zn)P/ZnS NCs, as the end groups affect the polarity of the molecules and result in a different steric arrangement. We found that use of SMP with bulky end groups (ZDBzT) results in nanocrystals with higher photoluminescence quantum yield (PL QY) and better dispersibility than those synthesized with SMPs with the shorter alkyl chain groups (ZDMT, ZDET, or ZDBT). At the optimal conditions, the PL QY of red emission In(Zn)P/ZnS NCs is 55 ± 4%, which is one of the highest values reported. On the basis of structural (XAS, XPS, XRD, TEM) and optical characterization, we propose a mechanism for the growth of a ZnS shell on an In(Zn)P core. |
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| 856 | 4 | _ | |u http://www.pubfacts.com/fulltext_frame.php?PMID=25252171&title=Understanding%20the%20role%20of%20single%20molecular%20ZnS%20precursors%20in%20the%20synthesis%20of%20In%28Zn%29P/ZnS%20nanocrystals. |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/185878/files/FZJ-2015-00015.pdf |y Restricted |
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