期刊
MICROCHIMICA ACTA
卷 183, 期 9, 页码 2571-2578出版社
SPRINGER WIEN
DOI: 10.1007/s00604-016-1898-0
关键词
Nanoparticles; Hybrid material; PAMAM; APTES; Hydrothermal synthesis; Quenching; X-ray photoelectron spectroscopy
资金
- National Natural Science Foundation of China [21475092]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Project of Scientific and Technologic Infrastructure of Suzhou [SZS201207]
- Open Research Project of the Battery Technology Innovation Center for Public Services of Jiangsu Province [HDP201206]
This article reports on the synthesis of water dispersible carbon quantum dots (CDs) by a one-step hydrothermal method using polyamidoamine (PAMAM) and (3-aminopropyl)triethoxysilane (APTES) as a platform and passivant. The resulting CDs are highly uniform and finely dispersed. The synergistic effect between PAMAM and APTES on the surface of the CDs results in a fluorescence that is much brighter than that of CDs modified with either APTES or PAMAM only. The fluorescence of the co-modified CDs is quenched by Hg(II) ions at fairly low concentrations. Under the optimum conditions, the intensity of quenched fluorescence drops with Hg(II) concentration in the range from 0.2 nM to 10 mu M, and the detection limit is 87 fM. The effect of potentially interfering cations on the fluorescence revealed a high selectivity for Hg2+. The fluorescent probe was applied to the determination of Hg(II) in (spiked) waters and milk and gave recoveries between 95.6 and 107 %, with relative standard deviation between 4.4 and 6.0 %.
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