Journal
ACS OMEGA
Volume 4, Issue 1, Pages 1581-1591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.8b03191
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Funding
- DST, New Delhi
- MNIT Jaipur
- DST Inspire doctoral fellowship
- CSIR [01(2854)/16/EMR-II]
- DST [SB/EMEQ-383/2014]
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The present finding describes an efficient facile approach for the fabrication of nitrogen-doped carbon dots (N-CDs) as a fluorescent nanoswitch. Highly fluorescent blue-light-emitting N-CDs have been synthesized via a simpler hydrothermal method using 2,2'-(ethylenedioxy)-bis(ethylamine) and malic acid as the precursors. N-CDs showed excitation-dependent and pH-independent emission along with a quantum yield of similar to 25%. The blue fluorescent emission of N-CDs has been selectively turned off (quenching of fluorescence (FL)) during the sensing of Cr(VI) with 0.02 mu M limit of detection and further been selectively turned on (restoration of FL) on sensing ascorbic acid, compared with other metal cations and biomolecules tested. For testing the practical applicability of N-CDs, the switchable reversibility of the fluorescent nanoswitch has been tested for up to four cycles on the basis of FL on-off-on. Furthermore, the toxicological test showed the antibacterial effect of the N-CDs on the tested Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli cells. Additionally, these N-CDs can also be used as a fluorescent ink for imaging purposes.
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