Ratiometric fluorometric determination of sulfide using graphene quantum dots and self-assembled thiolate-capped gold nanoclusters triggered by aluminum.

Autor: Alyami BA; Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, 11001, Najran, Saudi Arabia., Mahmoud AM; Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, 11001, Najran, Saudi Arabia., Alqarni AO; Department of Pharmaceutical Chemistry, College of Pharmacy, Najran University, 11001, Najran, Saudi Arabia., Ali ABH; Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt., El-Wekil MM; Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt. mohamed.mohamoud@ymail.com.
Jazyk: angličtina
Zdroj: Mikrochimica acta [Mikrochim Acta] 2023 Nov 13; Vol. 190 (12), pp. 467. Date of Electronic Publication: 2023 Nov 13.
DOI: 10.1007/s00604-023-06042-0
Abstrakt: A ratiometric-based fluorescence emission system was proposed for the determination of sulfide. It consists of blue emissive graphene quantum dots (GQDs) and self-assembled thiolate-protected gold nanoclusters driven by aluminum ion (Al 3+ @GSH-AuNCs). The two types of fluorophores are combined to form a ratiometric emission probe. The orange emission of Al 3+  @GSH-AuNCs at 624 nm was quenched in the presence of sulfide ion owing to the strong affinity between sulfide and Au(I), while the blue GQDs fluorescence at 470 nm remained unaffected. Interestingly, the Al 3+ @GSH-AuNCs and GQDs were excited under the same excitation wavelength (335 nm). The response ratios (F 470 /F 624 ) are linearly proportional to the sulfide concentration within the linear range of 0.02-200 µM under the optimal settings, with a limit of detection (S/N = 3) of 0.0064 µM. The proposed emission probe was applied to detect sulfide ions in tap water and wastewater specimens, with recoveries ranging from 95.3% to 103.3% and RSD% ranging from 2.3% to 3.4%, supporting the proposed method's accuracy.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.)
Databáze: MEDLINE
Externí odkaz: