Synthesis of highly fluorescent RhDCP as an ideal inner filter effect pair for the NaYF4:Yb,Er upconversion fluorescent nanoparticles to detect trace amount of Hg(II) in water and food samples

Publication date: Available online 25 June 2019Source: Journal of Photochemistry and Photobiology A: ChemistryAuthor(s): Annavaram Viswadevarayalu, Chen Min, Kutsanedzie Y.H. Felix, Agyekum A. Akwasi, Zareef Muhammad, Waqas Ahmad, Hassan Md Mehadi, Huanhuan Li, Chen QuanshengAbstractIn the present work, a new approach is established for the selective and sensitive detection of trace amount of Hg(II) using spirolactam appended rhodamine-B based organic complex-RhDCP and upconversion-luminescent nanoparticles mixed system. Highly stable and water dispersable upconversion-luminescent nanoparticles and organic complex RhDCP was synthesized, characterized and confirmed. The developed RhDCP- upconversion-luminescent nanoparticles (NaYF4: Yb, Er) sensing probe exhibited pronounced selective enhancement in the absorption intensity and fluorescence quenching in the presence of Hg(II) ions. Based on the quantitative reaction between the (RhDCP and Hg(II)), a significant spectral overlap between the emission and absorption bands of upconversion-luminescent nanoparticles and RhDCP- Hg(II) occurred thereby resulting in inner filter effect induced emission quenching. At different optimal conditions, the RhDCP-upconversion fluorescence quenching efficiency was proportional to the concentration of Hg(II) owing to the inner filter effect. The proposed sensing strategy could sensitively detect Hg(II) as low as 13.5 nM. The practical applicability of the developed sensing method is establishe...
Source: Journal of Photochemistry and Photobiology A: Chemistry - Category: Chemistry Source Type: research