Analyte-enhanced photocatalytic activity of CdSe/ZnS quantum dots for paper-based colorimetric sensing of Hg2+ under visible light
•CdSe/ZnS QDs exhibited remarkable Hg2+-enhanced photocatalytic activity for TMB oxidation under visible light.•A signal-on paper-based colorimetric device for Hg2+ detection was established.•A detection limit of 0.09 μM and a wide linearity of four orders of magnitude were achieved.•The device was...
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Published in | Microchemical journal Vol. 164; p. 106037 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.05.2021
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Subjects | |
Online Access | Get full text |
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Summary: | •CdSe/ZnS QDs exhibited remarkable Hg2+-enhanced photocatalytic activity for TMB oxidation under visible light.•A signal-on paper-based colorimetric device for Hg2+ detection was established.•A detection limit of 0.09 μM and a wide linearity of four orders of magnitude were achieved.•The device was applied for real samples including tap water and cosmetics.
CdSe/ZnS quantum dots (QDs) and 3,3,5,5-tetramethylbenzidine (TMB) were incorporated into a filter paper to produce a paper-based colorimetric device for Hg2+ detection. Under visible light, the CdSe/ZnS QDs acted as a photocatalyst to oxidize TMB, resulting in blue colorization on the paper. Moreover, Hg2+ could enhance the photocatalytic activity of CdSe/ZnS QDs and consequently caused an increase in the color intensity of the paper. The color change of the paper-based device can be directly identified by naked-eye observation or captured by a smartphone and analyzed using image processing software for quantitative analysis. Under optimal conditions, a low detection limit of 0.09 µM was achieved. This device was applied for real samples, including tap water and cosmetics, and achieved satisfying results. |
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ISSN: | 0026-265X 1095-9149 |
DOI: | 10.1016/j.microc.2021.106037 |