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Issue 101, 2014
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Fabrication, gradient extraction and surface polarity-dependent photoluminescence of cow milk-derived carbon dots

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Abstract

Cow milk-derived carbon dots (CMCD) were separated using a simple and cheap “gradient extraction” method, which was applied for the first time in nanomaterials' separation. The surface polarity of the extracted CMCD correlates well with the polarity of the extraction solvent. Interestingly, the surface polarity also affects the photoluminescence (PL) of CMCD: a red-shift of PL was observed as the surface polarity increased, which was attributed to the increasing amount of polar functional groups on the surface as auxochromes which are bound to graphitic sp2 clusters and reduce their energy gaps. Furthermore, as the surface polarity of CMCD increases, their PL exhibits longer lifetimes and a stronger excitation-dependency, which are attributed to the more efficient “internal” energy transfer from the auxochrome-poor sp2 clusters to the auxochrome-rich sp2 clusters of the CMCD.

Graphical abstract: Fabrication, gradient extraction and surface polarity-dependent photoluminescence of cow milk-derived carbon dots

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Publication details

The article was received on 30 Aug 2014, accepted on 28 Oct 2014 and first published on 29 Oct 2014


Article type: Paper
DOI: 10.1039/C4RA09520K
RSC Adv., 2014,4, 58084-58089

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    Fabrication, gradient extraction and surface polarity-dependent photoluminescence of cow milk-derived carbon dots

    S. Han, H. Zhang, J. Zhang, Y. Xie, L. Liu, H. Wang, X. Li, W. Liu and Y. Tang, RSC Adv., 2014, 4, 58084
    DOI: 10.1039/C4RA09520K

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