A Highly Sensitive and Selective Fluorescent Probe Using MPA-InP/ZnS QDs for Detection of Trace Amounts of Cu<sup>2+</sup> in Water
Detection of copper (II) ions (Cu<sup>2+</sup>) 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)...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9318e121f65d47af9f2f0e61dd900efd |
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| Sumario: | Detection of copper (II) ions (Cu<sup>2+</sup>) 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 Cu<sup>2+</sup> in water. The fluorescence of MPA-InP/ZnS QDs can be quenched significantly in the presence of Cu<sup>2+</sup>, and the fluorescence intensity shows excellent linearity when the concentration of Cu<sup>2+</sup> 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 Cu<sup>2+</sup> in real water samples and drink samples, showing good feasibility. |
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