| Dually emitting carbon dots as fluorescent probes for ratiometric fluorescent sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms | |
Li, Bo; Ma, Hong; Zhang, Bo ; Qian, Jing; Cao, Ting; Feng, Haitao; Li, Wu; Dong, Yaping; Qin, Wenwu
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| 2019-06 | |
| 发表期刊 | MICROCHIMICA ACTA
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| ISSN | 0026-3672 |
| 卷号 | 186期号:6 |
| 摘要 | The authors describe the preparation of carbon dots (CDs) that display both blue (similar to 410nm) and yellow (similar to 565nm) emission peaks. The CDs was synthesized by solvothermal treatment of o-phenylenediamine in aqueous ethyl alcohol at pH similar to 7.0. The CDs are shown to be useful fluorescent probes for pH values in that the ratio of fluorescences at 565 and 410nm strongly depends on the pH value in the range from 4.5-6.5 and 10.0-13.0, respectively. The blue fluorescence is quenched by 91% by 100 mu M solutions of Hg(II) through an electron transfer process, and is restored by 97% an addition of chloride (0.5mM). The yellow fluorescence, in contrast, is hardly affected. The ratio of fluorescences at 414 and 565nm drops linearly in the 30 to 60M of Hg(II) concentration range, and the limit of detection is 60nM. Fluorescence is linearly restored in the 70 to 180M chloride concentration range, and the LOD is 2.8nM. Both the blue and the yellow emission are reduced by Cr(VI) (chromate) due to an inner filter effect at pH3.0. The ratio of fluorescences (410/565nm) drops linearly in the 20 to 250M Cr(VI) concentration range, and the LOD is 260nM. The method was utilized to analysis of chloride in salt lake brine and of Cr(VI) in spiked tap water. |
| DOI | 10.1007/s00604-019-3437-2 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/34066 |
| 专题 | 盐湖资源综合利用工程技术中心 中国科学院青海盐湖研究所 |
| 推荐引用方式 GB/T 7714 | Li, Bo,Ma, Hong,Zhang, Bo,et al. Dually emitting carbon dots as fluorescent probes for ratiometric fluorescent sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms[J]. MICROCHIMICA ACTA,2019,186(6). |
| APA | Li, Bo.,Ma, Hong.,Zhang, Bo.,Qian, Jing.,Cao, Ting.,...&Qin, Wenwu.(2019).Dually emitting carbon dots as fluorescent probes for ratiometric fluorescent sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms.MICROCHIMICA ACTA,186(6). |
| MLA | Li, Bo,et al."Dually emitting carbon dots as fluorescent probes for ratiometric fluorescent sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms".MICROCHIMICA ACTA 186.6(2019). |
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