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Sulfur quantum dot as a fluorescent nanoprobe for Fe3+ ions: Uncovering of detection mechanism, high sensitivity, and large detection range.
- Source :
-
Journal of Luminescence . May2023, Vol. 257, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Sulfur quantum dots (SQDs), as a novel metal-free fluorescent material, are getting increasingly tremendous attention in metal ion detection, especially for Fe3+, due to the merits of antimicrobial potential, low toxicity, and exciting optoelectronic properties. However, sensing mechanism of SQD based fluorescent probe for Fe3+ is not clear yet, and high sensitivity and large detection range remain a challenge. Here, we report the synthesis of hydrophilic SQDs as a fluorescent nanoprobe for Fe3+ via a fluorescent turn-off mode. We systematically studied the quenching mechanism by ultraviolet–visible absorption spectra, steady-state and time-resolved photoluminescent spectra, and temperature-dependent quenching constants. Results unclearly evidenced the quenching behavior to both inner filter effect and static quenching. Furthermore, the nanoprobe presents a large detection range from 2.5 to 700 μM and a limit of detection low to 53.6 nM, both of which are the record performance to our knowledge. At last, it shows high selectivity toward Fe3+ and presents no ionic strength effect in the range of investigation, which enables surprising results for Fe3+ detection in deionized water with interference ion and real water samples. [Display omitted] • A novel fluorescent nanoprobe based on sulfur quantum dots for Fe3+ was reported. • The nanoprobe delivers a record detection range and limit of detection. • The sensing mechanism is systematically studied and uncovered. • The nanoprobe shows high selectivity and results for Fe3+ in real water samples. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 257
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 162387000
- Full Text :
- https://doi.org/10.1016/j.jlumin.2023.119693