| Visual Assay of Sulfide in Water Using a Dual-Emissive Ratiometric Fluorescence Probe |
| Paper ID : 1143-ICNS |
| Authors: |
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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 |
| Abstract: |
| 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. |
| Keywords: |
| Ratiometric fluorescence; Visual detection; Sulfide; Glutathione stabilized gold nanoclusters; Carbon dots |
| Status : Abstract Accepted (Poster Presentation) |