Abstract
We demonstrate the fabrication of a new DNA sensor that is based on the optical interactions occurring between oligonucleotide-coated NaYF4:Yb3+;Er3+ upconversion nanoparticles and the two-dimensional dichalcogenide materials, MoS2 and WS2. Monodisperse upconversion nanoparticles were functionalized with single-stranded DNA endowing the nanoparticles with the ability to interact with the surface of the two-dimensional materials via van der Waals interactions leading to subsequent quenching of the upconversion fluorescence. By contrast, in the presence of a complementary oligonucleotide target and the formation of double-stranded DNA, the upconversion nanoparticles could not interact with MoS2 and WS2, thus retaining their inherent fluorescence properties. Utilizing this sensor we were able to detect target oligonucleotides with high sensitivity and specificity whilst reaching a concentration detection limit as low as 5 mol·L−1, within minutes.

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Acknowledgements
Antonios G. Kanaras, Otto L. Muskens and Davide Giust would like to acknowledge funding from BBSRC (Grant No. BB/ N021150/1). Konstantina Alexaki would like to thank the University of Southampton for a Mayflower doctor of philosophy studentship.
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Alexaki, K., Giust, D., Kyriazi, ME. et al. A DNA sensor based on upconversion nanoparticles and two-dimensional dichalcogenide materials. Front. Chem. Sci. Eng. (2021). https://doi.org/10.1007/s11705-020-2023-9
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Keywords
- upconversion nanoparticles
- DNA sensor
- two-dimensional materials
- MoS2
- WS2