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Nano Lett. 2015 May 13;15(5):2844-51. doi: 10.1021/nl504439w. Epub 2015 Apr 27.

Intrinsic Chirality of CdSe/ZnS Quantum Dots and Quantum Rods.

Author information

1
†ITMO University, St. Petersburg, 197101, Russia.
2
‡School of Chemistry and CRANN, University of Dublin, Trinity College, Dublin 2, Ireland.

Abstract

A new class of chiral nanoparticles is of great interest not only for nanotechnology, but also for many other fields of scientific endeavor. Normally the chirality in semiconductor nanocrystals is induced by the initial presence of chiral ligands/stabilizer molecules. Here we report intrinsic chirality of ZnS coated CdSe quantum dots (QDs) and quantum rods (QRs) stabilized by achiral ligands. As-prepared ensembles of these nanocrystals have been found to be a racemic mixture of d- and l-nanocrystals which also includes a portion of nonchiral nanocrystals and so in total the solution does not show a circular dichroism (CD) signal. We have developed a new enantioselective phase transfer technique to separate chiral nanocrystals using an appropriate chiral ligand and obtain optically active ensembles of CdSe/ZnS QDs and QRs. After enantioselective phase transfer, the nanocrystals isolated in organic phase, still capped with achiral ligands, now display circular dichroism (CD). We propose that the intrinsic chirality of CdSe/ZnS nanocrystals is caused by the presence of naturally occurring chiral defects.

KEYWORDS:

Intrinsic chirality of nanocrystals; chiral defects; circular dichroism; screw dislocation; separation of nanocrystal enantiomers

PMID:
25908405
DOI:
10.1021/nl504439w

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