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An “on–off–on” fluorescence assay based on silicon nanoparticles for selective detection of manganese(II)

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Abstract

Highly blue luminescent and water-soluble silicon nanoparticles (Si NPs) are prepared by an efficient one-pot hydrothermal route from (3-aminopropyl) trimethoxysilane and ascorbic acid at 160 °C. The label-free Si NPs are demonstrated as an effective fluorescent probe for selective recognition of Mn2+. The linear range is from 2.5 to 250 μM and the detection limit is calculated to be 1.1 μM due to Mn2+ induced Si NP aggregation (turn-off). Additionally, the quenched fluorescence can be restored in the presence of EDTA because the EDTA can grab Mn2+ from the aggregated Si NPs–Mn2+ system owing to its strong chelating ability (turn-on). This sensing system based on the “on–off–on” fluorescence switching method can facilitate further development in Mn2+ detection.

Graphical abstract: An “on–off–on” fluorescence assay based on silicon nanoparticles for selective detection of manganese(ii)

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Publication details

The article was received on 26 Feb 2017, accepted on 03 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7AY00514H
Citation: Anal. Methods, 2017, Advance Article
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    An “on–off–on” fluorescence assay based on silicon nanoparticles for selective detection of manganese(II)

    L. Meng, Y. Yuan, G. Pu and N. Xu, Anal. Methods, 2017, Advance Article , DOI: 10.1039/C7AY00514H

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