Construction of a Turn-off–on Fluorescent System Based On Aggregation Induced Emission of Acetaldehyde Using Carbonized Polymer dots and Tb3+

Abstract

It was the rst time to report the aggregation induced emission (AIE) of acetaldehyde (AA) on the surface of carbonized polymer dots (CPDs) with the auxiliary of Tb 3+ . Based on the AIE of AA, a turn-off-on uorescence method was established for AA detection using the porous CPDs-Tb 3+ system. The one-pot hydrothermal method was used to obtain CPDs, using milk and polyethyleneimine (PEI) as precursors. In the presence of Tb 3+ , CPDs aggregated immediately, and the uorescence intensity decreased obviously for the precipitate. AA can effectively embed on the surface of CPDs-Tb 3+ due to the porous structure. AA displayed obviously blue uorescence with excitation wavelength at 370 nm (emission peak at 460 nm), while there was no uorescence peak when excited at 460 nm. In the CPDs-Tb 3+ solution, AA exhibits obvious uorescence enhancement effect (l ex 460 nm, l em 545 nm). And then, AA can be determined by the turn-off-on system based on the linear relationship between uorescence enhancement and the concentration of AA ranging from 0.04 mM to 42.48 mM. The limit of detection (LOD) was 0.02 mM. The turn-off-on system was successfully applied to determine AA in wine samples. The strategy may be exploited to monitor AA in more drinking or foodstuff samples.

Recent advances in the development of europium(iii) and terbium(iii)-based luminescent supramolecular metallogels

“…In CIE coordinates white light-emitting materials are located at equal energy points (0.33, 0.33). 65–72…”

“…In CIE coordinates white light-emitting materials are located at equal energy points (0.33, 0.33). [65][66][67][68][69][70][71][72] The physical, morphological, and optical properties of luminescent lanthanide gels are important to define the features of the gels. Therefore, it is very important to fully characterize these gel materials, which is often found to be difficult due to the dynamic nature of existing noncovalent interactions in these metallogels.…”