期刊
MICROCHEMICAL JOURNAL
卷 164, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.microc.2021.106037
关键词
Quantum dots; Photocatalytic activity; Paper-based colorimetric sensor; Mercury ions
资金
- Dean Foundation of Chinese Academy of Inspection and Quarantine [2020JK006]
A paper-based colorimetric device for Hg2+ detection was developed using CdSe/ZnS quantum dots and TMB, achieving a low detection limit and accurate detection of real samples.
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 ?M was achieved. This device was applied for real samples, including tap water and cosmetics, and achieved satisfying results.
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