Long-wavelength fluorescence of carbon dots (CDs) show the great
importance in multiple fields, especially for the biochemical sensing.
Here we proposed one type of CDs doped with nitrogen and sulfur through
the hydrothermal method, which exhibited the obvious yellow-fluorescence
in aqueous. Importantly, their fluorescence intensity of CDs decreased
with pH decreasing in the acidic range, thus a linear relationship
between pH and fluorescence intensity was established, and exhibiting
the potential of pH sensing. Additionally, introducing tigecycline into
CDs resulted in their decreased fluorescence, thus we further
established a strategy of detecting tigecycline with the concentration
range of 200 μM to 7 nM. Meanwhile, we elucidated the static quenching
as the major mechanism for CDs responding tigecycline, which was induced
by the formed new complex between CDs and tigecycline. Furthermore, the
practicality of the method was verified by examining the recovery of
tigecycline in the actual lake-water samples.
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