Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions
Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions
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石墨烯量子点与铜(II)离子结合作为荧光探针用于硫离子的开启检测
DOI:
10.1007/s00604-015-1548-y
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发表时间:
2015-07
期刊:
影响因子:
--
通讯作者:
Lingxin Chen
中科院分区:
文献类型:
--
作者:
Xiaqing Xu;Xiaoyan Wang;Yanbin Li;Lingxin Chen
AbstractA fluorescent probe for the sensitive and selective determination of sulfide ions is presented. It is based on the use of graphene quantum dots (GQDs) which emit strong and stable blue fluorescence even at high ionic strength. Copper(II) ions cause aggregation of the GQDs and thereby quench fluorescence. The GQDs-Cu(II) aggregates can be dissociated by adding sulfide ions, and this results in fluorescence turn on. The change of fluorescence intensity is proportional to the concentration of sulfide ions. Under optimal conditions, the increase in fluorescence intensity on addition of sulfide ions is linearly related (r2 = 0.9943) to the concentration of sulfide ions in the range from 0.20 to 20 μM, and the limit of detection is 0.10 μM (at 3 σ/s). The fluorescent probe is highly selective for sulfide ions over some potentially interfering ions. The method was successfully applied to the determination of sulfide ions in real water samples and gave recoveries between 103.0 and 113.0 %.
Graphical AbstractGraphene quantum dots (GQDs) emit strong blue fluorescence which, however, is quenched by copper(II) ions due to the formation of GQDs-Cu(II) aggregates. Fluorescence is recovered by sulfide ions due to the dissociation of GQDs-Cu(II) aggregates.
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