1. Smartphone-Enabled Fluorescence and Colorimetric Platform for the On-Site Detection of Hg 2+ and Cl − Based on the Au/Cu/Ti 3 C 2 Nanosheets.
- Author
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Chen, Keyan, Fu, Shiqi, Jin, Chenyu, Guo, Fan, He, Yu, Ren, Qi, and Wang, Xuesheng
- Subjects
COPPER ,FLUORESCENCE ,COLORIMETRIC analysis ,GOLD nanoparticles ,MERCURY ,NANOSTRUCTURED materials ,COPPER-titanium alloys ,COPPER chlorides - Abstract
Smartphone-assisted fluorescence and colorimetric methods for the on-site detection of Hg
2+ and Cl− were established based on the oxidase-like activity of the Au–Hg alloy on the surface of Au/Cu/Ti3 C2 NSs. The Au nanoparticles (NPs) were constructed via in-situ growth on the surface of Cu/Ti3 C2 NSs and characterized by different characterization techniques. After the addition of Hg2+ , the formation of Hg–Au alloys could promote the oxidization of o-phenylenediamine (OPD) to generate a new fluorescence emission peak of 2,3-diaminopenazine (ADP) at 570 nm. Therefore, a turn-on fluorescence method for the detection of Hg2+ was established. As the addition of Cl− can influence the fluorescence of ADP, the fluorescence intensity was constantly quenched to achieve the continuous quantitative detection of Cl− . Therefore, a turn-off fluorescence method for the detection of Cl− was established. This method had good linear ranges for the detection of Hg2+ and Cl− in 8.0–200.0 nM and 5.0–350.0 µM, with a detection limit of 0.8 nM and 27 nM, respectively. Depending on the color change with the detection of Hg2+ and Cl− , a convenient on-site colorimetric method for an analysis of Hg2+ and Cl− was achieved by using digital images combined with smartphones (color recognizers). The digital picture sensor could analyze RGB values in concentrations of Hg2+ or Cl− via a smartphone app. In summary, the proposed Au/Cu/Ti3 C2 NSs-based method provided a novel and more comprehensive application for environmental monitoring. [ABSTRACT FROM AUTHOR]- Published
- 2023
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