Abstract
Copper (Cu2+) detection is of great significance as it is important constituent of human body and its excessive amount may cause the neurodegenerative diseases. Herein, we developed fluorogenic indicator Eu3+ complex (Eu(TTA)3phen) embedded a novel polyvinylidene fluoride (PVDF)/polyvinylpyrrolidone (PVP) hybrid fibrous membrane (HFM), prepared via electrospinning technique, for the Cu2+ detection in the aqueous media. Compared with conventional pristine PVDF membrane, the current PVDF/PVP hybrid flexible fibrous membrane exhibited improved hydrophilicity (contact angle decreased from 135° to 33°), which was attributed to uniformly dispersed PVP. Scanning electron microscopic study confirmed the bead like nanofibrous morphology of electrospun Eu(TTA)3phen doped PVDF/PVP hybrid membrane. The devised nanofibrous membrane exhibited a fast response and good selectivity and sensitivity towards Cu2+, almost no response was observed for other ions. Efficient fluorescence quenching was observed upon addition of Cu2+ ions onto the membrane owing to the interruption of antenna affect from ligand to Eu3+. The current nanofibrous membrane sensor allowed the Cu2+ detection in the range of 2.5–30 μM, with a detection limit of 4.47 μM in aqueous media, demonstrating its potential for use in the clinical test of neurodegenerative diseases.
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