A Highly Sensitive and Selective Fluorescent Probe Using MPA-InP/ZnS QDs for Detection of Trace Amounts of Cu2+ in Water

Abstract

Detection of copper (II) ions (Cu2+) in water is important for preventing them from entering the human body to preserve human health. Here, a highly sensitive and selective fluorescence probe that uses mercaptopropionic acid (MPA)-capped InP/ZnS quantum dots (MPA-InP/ZnS QDs) was proposed for the detection of trace amounts of Cu2+ in water. The fluorescence of MPA-InP/ZnS QDs can be quenched significantly in the presence of Cu2+, and the fluorescence intensity shows excellent linearity when the concentration of Cu2+ varies from 0–1000 nM; this probe also exhibits an extremely low limit of detection of 0.22 nM. Furthermore, a possible fluorescence-quenching mechanism was proposed. The MPA-InP/ZnS QDs probes were further applied to the detection of trace Cu2+ in real water samples and drink samples, showing good feasibility.

Fluorescent Quantum Dots and Its Composites for Highly Sensitive Detection of Heavy Metal Ions and Pesticide Residues: A Review

“…Diffusive encounters and collision contact can be attributed to the dynamic quenching process, while new complex forms without changes in fluorescence lifetime will be assigned to the static quenching process [52]. However, dynamic quenching (i.e., FRET, PET) can cause changes in the fluorescence lifetime of fluorescence QDs after adding analytes, while these changes cannot be observed in IFEs and SQEs [53]. In addition, the fluorescence enhancement of QDs caused by the interaction of QDs and analytes can be attributed to surface plasmon enhanced fluorescence (SPEF), which is also referred to as metal surface enhanced fluorescence (MEF) and chelate enhanced fluorescence (CHEF).…”

Y3+@CdTe quantum dot nanoprobe as a fluorescence signal enhancement sensing platform for the visualization of norfloxacin

“…E-mail: 202161105067@njtech.edu.cn, 939282366@qq.com, 202261205195@njtech.edu.cn, yaocheng@njtech.edu.cn applications. 17,18 CdTe QDs have been reported to be of great advantage in the detection of antibiotic drugs. [19][20][21] At the same time, Y 3+ enhances the single-signal emission of tetracycline, and Y 3+ has been successfully used for sensing the detection of tetracycline.…”

“…Quantum dots (QDs), being highly environmentally stable, photo-stable, and brightly fluorescent materials, have unique size and composition-tunable fluorescence characteristics, 16 which make them very attractive for fluorescence sensing applications. 17,18 CdTe QDs have been reported to be of great advantage in the detection of antibiotic drugs. 19–21 At the same time, Y 3+ enhances the single-signal emission of tetracycline, and Y 3+ has been successfully used for sensing the detection of tetracycline.…”

Preparation of Novel Nanomaterial and Its Application in Food Industry

“…The ic-ELISA method based on the nanobody N56 was validated with spiked water sample and confirmed by UPLC-MS/MS, which indicated that the ic-ELISA established in this work is a reproducible detection assay for nodularin residues in water samples. Xu et al [12] prepared a highly sensitive and selective fluorescence probe that used mercaptopropionic acid (MPA)-capped InP/ZnS quantum dots (MPA-InP/ZnS QDs) for the detection of trace amounts of Cu 2+ in water. This probe exhibited an extremely low limit of detection of 0.22 nM.…”