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:
Microchim Acta
影响因子:
--
通讯作者:
Lingxin Chen
Lingxin Chen
中科院分区:
其他
文献类型:
--
作者:
Xiaqing Xu;Xiaoyan Wang;Yanbin Li;Lingxin Chen

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提出了一种灵敏、选择性测定硫化物离子的荧光探针。它基于石墨烯量子点(GQD)的使用,即使在高离子强度下也能发出强烈而稳定的蓝色荧光。铜(II)离子引起GQD的聚集,从而猝灭荧光。通过加入硫离子,GQDS-Cu(II)聚集体可以解离,从而导致荧光的开启。荧光强度的变化与硫离子浓度成正比。在最佳条件下,加入硫离子后荧光强度的增加与硫离子浓度在0.2~20 = M范围内呈线性关系(R2 = 0.9943),检出限为0.10μM(3μ/S)。该荧光探针对硫化物离子具有很高的选择性,而不是一些潜在的干扰离子。方法用于实际水样中硫化物离子的测定,回收率在103.0~113.0%之间。 图形摘要石墨烯量子点(GQD)发出强烈的蓝色荧光,但由于GQD-Cu(II)聚集体的形成,该荧光会被铜(II)离子猝灭。由于GQDS-Cu(II)聚集体的解离,荧光被硫离子恢复。
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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