Size controlled synthesis of carbon quantum dots using hydride reducing agents
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Date
2014-06-04
Authors
Linehan, Keith
Doyle, Hugh
Journal Title
Journal ISSN
Volume Title
Publisher
The Royal Society of Chemistry
Published Version
Abstract
Highly luminescent carbon quantum dots (CQDs) are synthesized at room temperature by hydride reduction of carbon tetrachloride (CCl4) within inverse micelles. Regulation of the average diameter of the allylamine terminated CQDs is achieved by varying the strength of the reducing agent used. Transmission electron microscopy shows that the NCs are highly crystalline with well-defined core diameters tuned from 2 to 6 nm, while FTIR and XPS spectroscopy confirm that the CQDs possess similar surface chemistry. UV-Vis and PL spectroscopy show significant quantum confinement effects, with moderate absorption in the UV spectral range, and a strong, narrow luminescence in the visible with a marked dependency on excitation wavelength. Time resolved photoluminescence measurements showed lifetimes for all CQDs in the ns range, while a maximum PL quantum yield of 27% is observed for the CQDs.
Description
Keywords
Nanocrystals , Nanodots , Graphite , Yields
Citation
LINEHAN, K. & DOYLE, H. 2014. Size controlled synthesis of carbon quantum dots using hydride reducing agents. Journal of Materials Chemistry C, 2, pp. 6025-6031. doi:10.1039/C4TC00826J
Link to publisher’s version
Copyright
© 2014, the Authors.