Ultrasensitive Silicon Nanoparticle Ratiometric Fluorescence Determination of Mercury(II)
- 18 January 2018
- journal article
- research article
- Published by Taylor & Francis Ltd in Analytical Letters
- Vol. 51 (7), 1013-1028
- https://doi.org/10.1080/00032719.2017.1370595
Abstract
A novel ratiometric fluorescence sensing system for the ultrasensitive detection of Hg2+ was developed. It used aminofunctionalized silicon nanoparticles and rhodamine B, which exhibit two distinct fluorescence emission peaks at 449 and 581 nm, respectively, under a single excitation wavelength (350 nm). The fluorescence of the amino-functionalized silicon nanoparticles was selectively quenched by Hg2+, while that of rhodamine B was insensitive to Hg2+. The ratio of fluorescence intensities at 449–581 nm linearly decreased with increasing concentrations of Hg2+ from 0.005–0.1 and 0.1–7 µM within 0.5 min, and a detection limit as low as 3.3 nM was achieved. Moreover, the ratiometric fluorescence sensing system exhibited good selectivity toward Hg2+ over other metal ions with relatively low background interference, even in a complex matrix such as lake water. Most importantly, the practical use of this sensing system for Hg2+ detection in real water samples was also demonstrated.Keywords
Funding Information
- National Natural Science Foundation of China (21375037,21475043,21675051)
- the Foundation of the Science & Technology Department of Hunan Province (2016SK2020)
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