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Highly selective detection of phosphate ion based on a single-layered graphene quantum dots-Al3+ strategy
Determination of phosphate ion (PO43-) is important in biomedical and environmental arrays because its controlling concentrations are associated with different pathologies or the quality of water. Herein, we report a new type of photoluminescence (PL) probe for highly selective detection of PO43- ba...
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Published in: | Talanta (Oxford) 2018-02, Vol.178, p.172-177 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Determination of phosphate ion (PO43-) is important in biomedical and environmental arrays because its controlling concentrations are associated with different pathologies or the quality of water. Herein, we report a new type of photoluminescence (PL) probe for highly selective detection of PO43- based on a single-layered graphene quantum dots chelating with aluminium ions (s-GQDs-Al3+) system. The PL of s-GQDs can be enhanced by Al3+ through the aggregation-induced emission enhancement (AIEE) effect. With the addition of PO43-, the PL of the s-GQDs-Al3+ system is faded away because PO43- has stronger coordination with Al3+ which results in the elimination of AIEE effect and the decrease in the PL intensity of the s-GQDs-Al3+ system. Therefore, the s-GQDs-Al3+ system can behave as an on-off type PL probe for PO43- detection. It is found that the PL intensity ratio (I/I0) of s-GQDs in the presence of Al3+ at 463nm is proportional to the concentration of PO43- in the range of 0.25–7.5μM with the limit of detection as low as 0.1μM. This selective assay has a great application prospect in the complex matrixes owing to its simplicity and specificity for PO43- detection.
Highly selective detection of phosphate ion based on a single-layered graphene quantum dots-aluminium ions (s-GQDs-Al3+) strategy. [Display omitted]
•TThe AIEE effect of s-GQDs induced by Al3+ is highly selective, and other metal ions have no effect on s-GQDs.•The s-GQDs-Al3+ system is stable, and is firstly acted as an on-off type fluorescent probe for PO43- detection.•The proposed method is characterized by rapid, low cost and label-free, and has good selectivity and high reproducibility for PO43- detection. |
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ISSN: | 0039-9140 1873-3573 |
DOI: | 10.1016/j.talanta.2017.09.007 |