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Development of Ultrasensitive and Arsenic (III) Selective Upconverting (NaYF4: Yb3+, Er3+) Platform

preprint
submitted on 12.05.2020 and posted on 13.05.2020 by Suman Duhan, Kedar Sahoo, Sudhir Kumar Singh, Manoj Kumar
The development of a sensitive alpha-NaYF4:Yb3+, Er3+ solid-phase upconverting platform (UCP) has been realized using Moringa oleifera leaf extract for selective detection of arsenic (As III) contamination in drinking water. The presence of polyphenols in the leaves extract is shown to induce luminescence resonance transfer (LRET), diminishing thereby the Er3+ upconverting red and green emissions activated by 980 nm excitation. However, addition of As3+ species interrupts the LRET process and restores emission proportionately. This feature allows platform to selectively detect arsenic pollution in water below the safe limit of 10 ppt. The uniqueness of UCP lies in monitoring the As3+ contamination in samples containing heavy ions (Cd2+, Hg2+) as well, without apparent effect on the signal reproducibility. UCP is also found to be insensitive to other interfering ions like Pb2+, H2PO4-, F-, Cl-, Ca2+, Mg2+, Sn2+, Cr6+, Fe2+ and Co2+, if present.

History

Email Address of Submitting Author

manojk.che@iitbhu.ac.in

Institution

IIT (BHU) Varanasi

Country

India

ORCID For Submitting Author

0000-0002-6278-781X

Declaration of Conflict of Interest

All authors declare no conflict of interest

Version Notes

First version of manuscript submitted to Analyst for review

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