Dual-emissive nanohybrid of carbon dots and gold nanoclusters for sensitive determination of mercuric ions

Dual-emissive nanohybrid of carbon dots and gold nanoclusters for sensitive determination of mercuric ions
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碳点和金纳米团簇的双发射纳米杂化物用于灵敏测定汞离子

DOI:
10.1007/s12274-016-1099-5
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发表时间:
2016-05
期刊:
影响因子:
9.9
通讯作者:
Suhua Wang
Suhua Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Yehan Yan;Huan Yu;Kui Zhang;Mingtai Sun;Yajiao Zhang;Xiangke Wang;Suhua Wang

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目前的工作报告了一种灵敏的选择性荧光传感器,通过碳纳米点(C-dots)和金纳米簇(Au NCs)通过两种成分的内在相互作用进行杂化,用于检测汞离子Hg(II)。 C 点用作参考信号,Au NC 用作报告分子。该方法采用特定的高亲和力亲金属Hg2+-Au+相互作用,可以极大地猝灭Au NCs的红色荧光,而C点的蓝色荧光对Hg(II)稳定,当暴露于Hg(II)时导致明显的比率荧光变化。估计水溶液中 Hg(II) 的检测限为 28 nM。因此我们将该传感器应用于自来水、湖水、矿泉水等实际水样中Hg(II)的检测,取得了良好的效果。我们进一步证明,可以通过将纳米混合探针固定在醋酸纤维素圆形滤纸上来制造视觉化学传感器。纸基传感器在暴露于一滴 Hg(II) 溶液后立即显示出从粉红色到蓝色的明显荧光颜色演变。
The present work reports a sensitive and selective fluorescent sensor for the detection of mercury ion, Hg(II), by hybridizing carbon nanodots (C-dots) and gold nanoclusters (Au NCs) through intrinsic interactions of the two components. The C-dots serve as the reference signal and the Au NCs as the reporter. This method employs the specific high affinity metallophilic Hg2+–Au+interactions which can greatly quench the red fluorescence of Au NCs, while the blue fluorescence of C-dots is stable against Hg(II), leading to distinct ratiometric fluorescence changes when exposed to Hg(II). A limit of detection of 28 nM for Hg(II) in aqueous solution was estimated. Thus we applied the sensor for the detection of Hg(II) in real water samples including tap water, lake water and mineral water samples with good results. We further demonstrated that a visual chemical sensor could be manufactured by immobilizing the nanohybrid probe on a cellulose acetate circular filter paper. The paper-based sensor immediately showed a distinct fluorescence color evolution from pink to blue after exposure to a drop of the Hg(II) solution.
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