Journal
DYES AND PIGMENTS
Volume 173, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2019.107952
Keywords
Carbon dots; Luminescence; Turn-off fluorescence; Temperature sensing; Quenching mechanism
Funding
- National Natural Science Foundation of China [21601081]
- Guangxi Natural Science Foundation [2018GXNSFBA281209]
- Guangzhou Scientific planning program [201804010260]
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A high-efficient nitrogen and sulfur-doped carbon dots (CDs) were prepared from L-Cysteine (Cys) and trisodium citrate dihydrate using a hydrothermal method. The Cys-CDs were completely water-soluble and remarkably stable under various pH and ionic strength conditions. Cys-CDs show a absorption maximum at 350 nm and PL maximum at 450 nm with high fluorescence quantum yield of 68%. It is found that Cys-CDs exhibit linear temperature-dependent emission intensity responses at in the 283-343 K range, along with strongly temperature dependent monoexponential decay. The mechanism of temperature-dependent fluorescence is confirmed as temperature enhanced population of non-radiative channels by comparing radiative and nonradiative recombination rates at different temperature. All results indicate that Cys-CDs could be a promising material for fluorescent temperature-sensing application.
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