Rapid and selective detection of Fe (III) by using a smartphone-based device as a portable detector and hydroxyl functionalized metal-organic frameworks as the fluorescence probe.

Rapid and selective detection of Fe (III) by using a smartphone-based device as a portable detector and hydroxyl functionalized metal-organic frameworks as the fluorescence probe. Anal Chim Acta. 2019 Oct 24;1077:160-166 Authors: Zhao Y, Ouyang H, Feng S, Luo Y, Shi Q, Zhu C, Chang YC, Li L, Du D, Yang H Abstract Here, a label-free fluorescent sensor was developed for detection Fe (III) by utilizing the quenching effect of Fe (III) on the fluorescence of the hydroxyl functionalized metal-organic framework MIL-53(Fe)-(OH)2, which was synthesized by using a one-step solvothermal method. The specific binding interaction between Fe (III) and hydroxyl facilitated the absorption of free Fe (III) to MIL-53(Fe)-(OH)2, which leads to rapid fluorescent intensity quenching effect. The potential quenching mechanism was proved to be the photo-induced electron transfer (PET) from electron-rich ligands of MIL-53(Fe)-(OH)2 to the half-filled 3d orbitals of free Fe (III) in the sample solution. For in-field applications, the fluorescence signal was detected rapidly by using a homemade 3D-printed, portable, and low-cost smartphone sensor. A commercial 365 nm UV LED light was adopted as the excitation light source, while the camera in a smartphone was utilized as the optical detector. The fluorescent signals obtained by using the smartphone sensor were in a good agreement with those obtained from a commercial microplate reader. Under the optimal assa...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research