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Ratiometric Fluorescent Test Paper Based on Silicon Nanocrystals and Carbon Dots for Sensitive Determination of Mercuric Ions

Ratiometric Fluorescent Test Paper Based on Silicon Nanocrystals and Carbon Dots for Sensitive Determination of Mercuric Ions

Xinfeng Guo, Cui Liu, Nian Li, Shudong Zhang, Zhenyang Wang

R Soc Open Sci. 2018 Jun 27;5(6):171922.

PMID: 30110432

Abstract:

Classical dye absorption-based pH test papers are widely used to measure the degree of acidity of media for quantification or semi-quantification by the observation of the naked eye on the variation of colour. However, it remains a challenging task to extend portable and cheap methods to a wide range of analytes for accurate quantification. Here, we report a dosage-sensitive test paper for the assay of mercury ions (Hg2+) with wide colour evolution. The ratiometric fluorescent probe was prepared by mixing blue-emission silicon nanocrystals (Si NCs) and red-emission carbon dots (r-CDs). The Si NCs serve as the reaction site and the r-CDs as the internal reference. Upon the addition of Hg2+, the blue fluorescence of the Si NCs was quenched, while the red fluorescence of the r-CDs remained constant, resulting in the consecutive fluorescence colour changes from blue to orange red. The probe demonstrates high selectivity and sensitivity of the visualization assay of Hg2+ with a detection limit of 7.63 nM. Moreover, we printed the ratiometric fluorescence probe result onto a piece of filter paper to prepare a test paper, which represents an on-site, sensitive, rapid and cost-effective method for the visual determination of Hg2+ by the naked eye.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42113	Mercury on Filter Paper			Price

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