Red-emissive carbon dots (RCDs) were facilely synthesized
from o-phenylenediamine and catechol in ethanol through
a hydrothermal
method. The produced RCDs showed a triplet fluorescence emission around
597, 647, and 707 nm, respectively. The eco-friendly fluorescent pigment
was prepared by dispersing RCDs into poly(vinylpyrrolidone) for smart
textiles. Bright and stable fluorescent patterns on the cotton fabrics
were successfully created by a screen-printing technique. Based on
the pH-sensitive color change of RCDs, reversible volatile acid/amine-responsive
RCD-patterned smart textiles and paper indicators were also constructed,
respectively. Furthermore, fluorescence-sensing platforms were developed
for MnO4
– using an inner-filter-effect
approach. It was found that the present RCDs could be used for the
quantitative detection of MnO4
– in the
range of 0–7 μM in aqueous solution and for practical
water sample analysis with satisfactory recovery results.
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