Highly Selective and Sensitive Ratiometric Detection of Sn²⁺ Ions Using NIR-Excited Rhodamine-B-Linked Upconversion Nanophosphors.

ABSTRACT: Detection of Sn²⁺ ions in environmental and biological samples is essential owing to the toxicological risk posed by excess use tin worldwide. Herein, we have designed a nanoprobe involving upconversion nanophosphors linked with a rhodamine-based fluorophore, which is selectively sensitive to the presence of Sn²⁺ ions. Upon excitation with near-infrared (NIR) light, the green emission of the nanophosphor is reabsorbed by the fluorophore with an efficiency that varies directly with the concentration of the Sn²⁺ ions. We have explored this NIR-excited fluorescence resonance energy transfer (FRET) process for the quantitative and ratiometric detection of Sn²⁺ ions in an aqueous phase. We have observed an excellent linear correlation between the rati

SUBMITTER: Kumar J 

PROVIDER: S-EPMC9434793 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature