4.5 Article

Nitrogen-rich silicon quantum dots: facile synthesis and application as a fluorescent 'on-off-on' probe for sensitive detection of Hg2+ and cyanide ions

期刊

LUMINESCENCE
卷 37, 期 4, 页码 598-609

出版社

WILEY
DOI: 10.1002/bio.4195

关键词

cyanide; fluorescence quenching; fluorescence recovery; mercury (II); nitrogen-rich silicon quantum dots

资金

  1. Iran University of Science and Technology

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A novel fluorescent probe based on nitrogen-rich silicon quantum dots (NR-SiQDs) has been developed for sensitive detection of Hg2+ and CN- ions in water. The probe exhibited strong fluorescence emission, satisfactory salt tolerance, and superior photostability and pH stability. The detection of Hg2+ and CN- ions was achieved through an on-off-on mechanism.
The sensitive and reliable detection of Hg2+ and CN- as harsh environmental contaminants are of great importance. In view of this, a novel 'on-off-on' fluorescent probe based on nitrogen-rich silicon quantum dots (NR-SiQDs) has been designed for sensitive detection of Hg2+ and CN- ions in aqueous medium. NR-SiQDs were synthesized using a facile, one-step, and environment friendly procedure in the presence of 3-aminopropyl trimethoxysilane (APTMS) and ascorbic acid (AA) as precursors, with l-asparagine as a nitrogen source for surface modification. The NR-SiQDs exhibited strong fluorescence emission at 450 nm with 42.34% quantum yield, satisfactory salt tolerance, and superior photostability and pH stability. The fluorescence emission was effectively quenched using Hg2+ (turn-off) due to the formation of a nonfluorescent stable NR-SiQDs/Hg2+ complex, whereas after the addition of cyanide ions (CN-), Hg2+ ions could be leached from the surface of the NR-SiQDs and the fluorescence emission intensity of the quenched NR-SiQDs fully recovered (turn-on) due to the formation of highly stable [Hg(CN)(4)](2-) species. After optimizing the response conditions, the obtained limits of detection were found to be 53 nM and 0.46 mu M for Hg2+ and CN-, respectively. Finally, the NR-SiQD-based fluorescence probe was utilized to detect Hg2+ and CN- ions in water samples and satisfactory results were obtained, suggesting its potential application for environmental monitoring.

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