Abstract
Sulfur quantum dots have become a rising-star material due to their unique luminescence and chemical properties. Herein, highly stable blue luminescent sulfur quantum dots (β-SQDs) were rapidly synthesized by a solvothermal method using sublimated sulfur as the sulfur source and β-cyclodextrin (β-CD) as the passivator. The β-SQDs were extensively characterized with spherical particles enriched with a surface rich in polysulfide and sulfonic acid groups. The involvement of β-cyclodextrin regulated the size and dispersion of β-SQDs, reduced the aggregation-induced quenching effect, and significantly improved the luminescence properties. Notably, the inner filter effect and static quenching occurring between β-SQDs and acridine orange caused a dual change in ratiometric fluorescence (I460/I555) and scattered light signal (I708). Moreover, the assay exhibited satisfactory accuracy and recovery in the detection of real samples, indicating that β-SQDs will play an essential role in environmental analysis.
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