Journal
MICROCHIMICA ACTA
Volume 189, Issue 1, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-021-05119-y
Keywords
Platinum nanoclusters; EMSN@Pt NCs; Colorimetric detection; Fluorescence; Hg2+ detection; Peroxidase mimic
Categories
Funding
- Postdoctoral Fund of Hebei Medical University
- Postdoctoral Fund of Hebei Province [B2021003040]
- Natural Science Foundation of Hebei Province [H2020206416, B2021206005, B2019206437]
- Youth Top Talent Project of Hebei Province Higher Education [BJ2021050, BJ2020034]
- Chunyu Project Outstanding Youth Fund of Hebei Medical University [CYYQ2021003, CYYQ201903]
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A novel colorimetric/fluorescent dual-mode nanosensor for Hg2+ detection was developed using expanded mesoporous silica-encapsulated ultrasmall platinum nanoclusters. The sensor showed improved peroxidase-like and stable fluorescent activities, with excellent selectivity and reliability for detecting Hg2+ in Pueraria lobata.
A novel colorimetric/fluorescent dual-mode nanosensor for Hg2+ detection was constructed using expanded mesoporous silica (EMSN)-encapsulated ultrasmall platinum nanoclusters (EMSN@Pt NCs) with improved peroxidase-like and stable fluorescent activities. The sensing technique was based on the mechanism that the peroxidase mimetic activity and fluorescence intensity of EMSN@Pt NCs can be inhibited in the presence of Hg2+. In this sensing platform, a linear range of 5-50 nM with a detection limit of 1.78 +/- 0.38 nM and quantification limit of 5.93 nM was obtained via fluorescent analysis. A linear calibration curve from 0.25 to 200 nM with a detection limit of 8.25 +/- 0.51 nM and quantification limit of 27.47 nM was achieved via colorimetric analysis. The proposed dual-mode probe possesses excellent selectivity and reliability for Hg2+ detection, which can function as an efficient nanosensor for the quantitative determination of Hg2+ in Pueraria lobata.
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