Journal
NANOTECHNOLOGY
Volume 33, Issue 17, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac4b7a
Keywords
carbon dots; dispersed state; aggregation; concentration-dependent emission; HIV nucleic acid
Funding
- National Natural Science Foundation of China
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In this study, tunable fluorescence across the entire visible range was achieved in carbon dots (CDs) synthesized by hydrothermal method with amino-rich surface by simply controlling the concentration. The effects of concentration-induced aggregation and electrostatic-induced agglomeration were compared for the first time in terms of their fluorescence properties. It was found that both the aggregation of CDs and internal absorption filtration can cause concentration-dependent fluorescence emission. Additionally, the inter distance of adjacent CDs in their aggregates was enlarged by forming rigid double-stranded DNA (dsDNA) between adjacent CDs through base pairing.
In this study, carbon dots (CDs) synthesized by hydrothermal method with amino-rich surface exhibit tunable fluorescence across entire visible range by simply controlling the concentration. A comprehensive comparison has been performed for the first time between concentration-induced aggregation of the single-type CDs and electrostatic-induced agglomeration of opposite-charged CDs in terms of their fluorescence properties. Experimental results show that both the aggregation of CDs and internal absorption filtration are possible causes of the concentration-dependent fluorescence emission. Subsequently, the inter distance of adjacent CDs in their aggregates was enlarged by forming rigid double-stranded DNA (dsDNA) between adjacent CDs through base pairing. It is clear that the contact of CDs induces the changes of fluorescence emission and light absorption. Through a better understanding of the mechanisms behind concentration-induced multicolor emission, this work can provide a novel strategy to develop the advanced applications of CDs.
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