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Tuning the optical properties of silicon quantum dots via surface functionalization with conjugated aromatic fluorophores

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Zysman_Colman_2018_SciRep_TuningSilQD_CCBY_VoR.pdf (1.995Mb)
Date
14/02/2018
Author
Abdelhameed, Mohammed
Rota Martir, Diego
Chen, Shalimar
Xu, William Z.
Oyeneye, Olabode O.
Chakrabarti, Subrata
Zysman-Colman, Eli
Charpentier, Paul A.
Funder
EPSRC
Grant ID
EP/M02105X/1
Keywords
Silicon Quantum Dots
Energy transfer
Photoluminescence
Bioimaging
QD Chemistry
NDAS
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Abstract
Silicon Quantum Dots (SQDs) have recently attracted great interest due to their excellent optical properties, low cytotoxicity, and ease of surface modification. The size of SQDs and type of ligand on their surface has a great influence on their optical properties which is still poorly understood. Here we report the synthesis and spectroscopic studies of three families of unreported SQDs functionalized by covalently linking to the aromatic fluorophores, 9-vinylphenanthrene, 1-vinylpyrene, and 3-vinylperylene. The results showed that the prepared functionalized SQDs had a highly-controlled diameter by HR-TEM, ranging from 1.7–2.1 nm. The photophysical measurements of the assemblies provided clear evidence for efficient energy transfer from the fluorophore to the SQD core. Fӧrster energy transfer is the likely mechanism in these assemblies. As a result of the photogenerated energy transfer process, the emission color of the SQD core could be efficiently tuned and its emission quantum efficiency enhanced. To demonstrate the potential application of the synthesized SQDs for bioimaging of cancer cells, the water-soluble perylene- and pyrene-capped SQDs were examined for fluorescent imaging of HeLa cells. The SQDs were shown to be of low cytotoxicity.
Citation
Abdelhameed , M , Rota Martir , D , Chen , S , Xu , W Z , Oyeneye , O O , Chakrabarti , S , Zysman-Colman , E & Charpentier , P A 2018 , ' Tuning the optical properties of silicon quantum dots via surface functionalization with conjugated aromatic fluorophores ' , Scientific Reports , vol. 8 , 3050 . https://doi.org/10.1038/s41598-018-21181-8
Publication
Scientific Reports
Status
Peer reviewed
DOI
https://doi.org/10.1038/s41598-018-21181-8
ISSN
2045-2322
Type
Journal article
Rights
© 2018 the Authors. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Description
The authors acknowledge Karen Nygard at UWO Biotron for assistance with confocal microscopy. This work was financially supported by NSERC Canada Discovery (Charpentier).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12722

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