Visual Assay of Sulfide in Water Using a Dual-Emissive Ratiometric Fluorescence Probe
Paper ID : 1143-ICNS
Mohammad Amin Farahmand Nejad *1, Mohammad Reza Hormozi Nezhad2
1Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran
2Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran‎
Due to the wide use of sulfide in industrial operations, monitoring sulfide contamination in water resources is highly ‎demanded. Herein, we have developed a visual approach for sensitive detection of sulfide by simply mixing orange ‎emissive glutathione stabilized gold nanoclusters (AuNCs) and blue emissive urea stabilized carbon dots (CDs) in an ‎appropriate ratio within a ratiometric fluorescence (RF) strategy. Under a single excitation wavelength of 365 nm, the ‎RF probe exhibited a dual emission at 452 and 607 nm corresponding to CDs and AuNCs, respectively. Owing to the ‎high affinity of sulfide ions to AuNCs in alkaline medium, the orange fluorescence of AuNCs was selectively quenched ‎while the CDs emission remained unchanged, resulting in a distinguishable fluorescence color change from pink to blue ‎under a UV lamp. The I452/I607 ratio was linearly dependent on sulfide concentration in the range of 1.0 to 50.0 µM with ‎a limit of detection (LOD) of 0.35 µM. The proposed approach was successfully applied for the detection of sulfide in ‎river water with acceptable recoveries. ‎
Ratiometric fluorescence; Visual detection; Sulfide; Glutathione stabilized gold nanoclusters; Carbon dots
Status : Abstract Accepted (Poster Presentation)