Abstract
In this paper, we prepared fluorescence-tunable water-soluble CdS quantum dots (QDs) with hexametaphosphate as stabilizers by a simple route. The prepared CdS QDs were utilized to detect calcium ion (Ca2+) based on an obvious fluorescence enhancement of CdS QDs induced by Ca2+. The results demonstrated there was an excellent linear relationship between the fluorescence intensity of hexametaphosphate-capped CdS QDs and Ca2+ concentration in the range from 10μmol/L to 400μmol/L and the detection limit for Ca2+ was 4μmol/L. Furthermore, fluoride ions (F−) can react with Ca2+ to generate the insoluble calcium fluoride that would inhibit the Ca2+-induced fluorescence enhancement of CdS QDs. Therefore, the designed Ca2+-induced fluorescence enhancement system was also able to effectively detect fluoride.
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