Phase transfer of 1- and 2-dimensional Cd-based nanocrystals

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Kodanek, Torben; Banbela, Hadeel M.; Naskar, Suraj; Adel, Patrick; Bigall, Nadja C.; Dorfs, Dirk: Phase transfer of 1- and 2-dimensional Cd-based nanocrystals. In: Nanoscale 7 (2015), Nr. 45, S. 19300-19309. DOI: http://dx.doi.org/10.1039/C5NR06221G

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In this work, luminescent CdSe@CdS dot-in-rod nanocrystals, CdSe@CdS/ZnS nanorods as well as CdSe–CdS core–crown nanoplatelets were transferred into aqueous phase via ligand exchange reactions. For this purpose, bifunctional thiol-based ligands were employed, namely mercaptoacetic acid (MAA), 3-mercaptopropionic acid (MPA), 11-mercaptoundecanoic acid (MUA) as well as 2-(dimethylamino)ethanthiol (DMAET). Systematic investigations by means of photoluminescence quantum yield measurements as well as photoluminescence decay measurements have shown that the luminescence properties of the transferred nanostructures are affected by hole traps (induced by the thiol ligands themselves) as well as by spatial insulation and passivation against the environment. The influence of the tips of the nanorods on the luminescence is, however, insignificant. Accordingly, different ligands yield optimum results for different nanoparticle samples, mainly depending on the inorganic passivation of the respective samples. In case of CdSe@CdS nanorods, the highest emission intensities have been obtained by using short-chain ligands for the transfer preserving more than 50% of the pristine quantum yield of the hydrophobic nanorods. As opposed to this, the best possible quantum efficiency for the CdSe@CdS/ZnS nanorods has been achieved via MUA. The gained knowledge could be applied to transfer for the first time 2-dimensional CdSe–CdS core–crown nanoplatelets into water while preserving significant photoluminescence (up to 12% quantum efficiency).
License of this version: CC BY 3.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2015-10-28
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
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1 image of flag of Germany Germany 106 79.10%
2 image of flag of Saudi Arabia Saudi Arabia 12 8.96%
3 image of flag of United States United States 4 2.99%
4 image of flag of Vietnam Vietnam 2 1.49%
5 image of flag of Korea, Republic of Korea, Republic of 2 1.49%
6 image of flag of No geo information available No geo information available 1 0.75%
7 image of flag of Taiwan Taiwan 1 0.75%
8 image of flag of Syrian Arab Republic Syrian Arab Republic 1 0.75%
9 image of flag of Sweden Sweden 1 0.75%
10 image of flag of Poland Poland 1 0.75%
    other countries 3 2.24%

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