Ratiometric fluorescence detection of mercuric ion based on the nanohybrid of fluorescence carbon dots and quantum dots.
Ratiometric fluorescence detection of mercuric ion based on the nanohybrid of fluorescence carbon dots and quantum dots.
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DOI：
10.1016/j.aca.2013.05.015
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发表时间：
2013-07
影响因子：
6.2
通讯作者：
Benmei Cao;Chao Yuan;Bianhua Liu;Changlong Jiang;Guijian Guan;M. Han
中科院分区：
文献类型：
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作者：
Benmei Cao;Chao Yuan;Bianhua Liu;Changlong Jiang;Guijian Guan;M. Han
通过简单地将发蓝光的碳点（C-dots）与发红光的羧基甲基二硫代氨基甲酸酯修饰的CdSe@ZnS量子点（GDTC-QDs）混合，开发了一种由碳点（C-dots）和亲水性CdSe@ZnS量子点（QDs）组成的新型纳米杂化比率荧光探针。纳米杂化比率荧光探针在单一激发波长下在436 nm和629 nm处具有双发射。由于量子点表面的GDTC对汞离子（Hg 2+）具有很强的螯合能力，在Hg 2+存在下，纳米杂化体系中的GDTC-QDs的荧光可以被选择性地猝灭，而C点的荧光保持不变，导致纳米杂化体系的荧光颜色变化（从红色到蓝色）明显可区分。该方法的检出限低至0.1μM。该方法对真实的自来水和湖水中Hg 2+的测定结果令人满意，具有潜在的应用价值。
A novel nanohybrid ratiometric fluorescence probe comprised of carbon dots (C-dots) and hydrophilic CdSe@ZnS quantum dots (QDs) has been developed by simply mixing the blue-emission C-dots with red-emission carboxylmethyldithiocarbamate modified CdSe@ZnS QDs (GDTC-QDs). The nanohybrid ratiometric fluorescence probe exhibits dual emissions at 436nm and 629nm under a single excitation wavelength. Due to the strong chelating ability of GDTC on the surface of QDs to mercuric ion (Hg2+), the fluorescence of the GDTC-QDs in the nanohybrid system could be selectively quenched in the presence of Hg2+while the fluorescence of the C-dots remained constant, resulting in an obviously distinguishable fluorescence color evolution (from red to blue) of the nanohybrid system. The detection limit of this method was found to be as low as 0.1μM. Furthermore, the recovery result for Hg2+in real samples including tap water and lake water by this method was satisfying, suggesting its potential application for Hg2+sensing.