Nankai University

About: Nankai University is a education organization based out in Tianjin, China. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 42964 authors who have published 51866 publications receiving 1127896 citations. The organization is also known as: Nánkāi Dàxué.

A chiral lanthanide metal–organic framework for selective sensing of Fe(III) ions

Abstract: A new luminescent lanthanide metal–organic framework was synthesized under hydrothermal conditions by introducing the tetracarboxylic acid ligand (H4bptc) as a chromophore to sensitize the luminescence of the Tb3+ ion. Interestingly, despite the achiral nature of H4bptc, the resulting framework exhibited rare chiral helical channels. The luminescence studies revealed that this material showed a highly selective fluorescence quenching response to Fe3+ ions in liquid suspension, which can be conveniently observed by the naked eye under UV light. Thus, this material can be potentially used as a chemosensor for sensing Fe3+ ions and its selective luminescence quenching response can be explained in terms of the competitive absorption mechanism.

Graphene oxide based photoinduced charge transfer label-free near-infrared fluorescent biosensor for dopamine.

Abstract: While the super fluorescence quenching capacity of graphene and graphene oxide (GO) has been extensively employed to develop fluorescent sensors, their own unique fluorescence and its potential for chemo-/biosensing have seldom been explored. Here we report a GO-based photoinduced charge transfer (PCT) label-free near-infrared (near-IR) fluorescent biosensor for dopamine (DA). The multiple noncovalent interactions between GO and DA and the ultrafast decay at the picosecond range of the near-IR fluorescence of GO resulted in effective self-assembly of DA molecules on the surface of GO, and significant fluorescence quenching, allowing development of a PCT-based biosensor with direct readout of the near-IR fluorescence of GO for selective and sensitive detection of DA. The developed method gave a detection limit of 94 nM and a relative standard deviation of 2.0% for 11 replicate detections of 2.0 μM DA and was successfully applied to the determination of DA in biological fluids with quantitative recovery (98...