Fluorescence enhancement of fungicide thiabendazole by van der Waals interaction with transition metal dichalcogenide nanosheets for highly specific sensors
Entity
UAM. Departamento de Química Analítica y Análisis InstrumentalPublisher
RSCDate
2019-11-13Citation
10.1039/c9nr02794g
Nanoscale 11.48 (2019): 23156-23164
ISSN
2040-3364DOI
10.1039/c9nr02794gFunded by
The authors acknowledge financial support from the Spanish MINECO (MAT2017-85089-C2-1-R, MAT2017-85089-C2-2-R) and the EU via the ERC-Synergy Program (grant ERC-2013-SYG-610256 NANOCOSMOS) and Horizon 2020 Research and Innovation Program (Graphene Flagship-core2 – 785219) and the Comunidad Autónoma de Madrid (P2018/NMT-4349, TRANSNANOAVANSENS-CM and P2018/NMT-4367 FOTOART). J. I. M. acknowledges the support by the “Ramón y Cajal” Program of MINECO (grant RYC-2015-17730)Project
Gobierno de España. MAT2017-85089-C2-1-R; Gobierno de España. MAT2017-85089-C2-2-R; info:eu-repo/grantAgreement/EC/FP7/610256/NANOCOSMOS; info:eu-repo/grantAgreement/EC/H2020/785219/EU//GrapheneCore2; Comunidad de Madrid. P2018/NMT-4349/TRANSNANOAVANSENS-CM; Comunidad de Madrid. P2018/NMT-4367/FOTOARTEditor's Version
https://doi.org/10.1039/C9NR02794GSubjects
Energy dissipation; Fluorescence; Fungicides; Graphene; Layered semiconductors; Molecules; Molybdenum compounds; Nanosheets; Tungsten compounds; Van der Waals forces; QuímicaRights
© 2019, The Royal Society of ChemistryAbstract
Many molecules quench their fluorescence upon adsorption on surfaces. Herein we show that the interaction of thiabendazole, a widespread used fungicide of the benzimidazole family, with nanosheets of transition metal dichalcogenides, particularly of WS2, leads to a significant increase, more than a factor of 5, of the fluorescence yield. This surprising effect is rationalized by DFT calculations and found to be related to the inhibition of the intramolecular rotation between the benzimidazole and thiazole groups due to a bonding rigidization upon interaction with the MoS2 surface. This non-covalent adsorption leads to a redistribution of the molecular LUMO that blocks the non-radiative energy dissipation channel. This unusual behaviour does not operate either for other molecules of the same benzimidazole family or for other 2D materials (graphene or graphene oxide). Moreover, we found that a linear dependence of the emission with the concentration of thiabendazole in solution, which combined with the specificity of the process, allows the development of a highly sensitive and selective method towards thiabendazole determination that can be applied to real river water samples. An excellent detection limit of 2.7 nM, comparable to the best performing reported methods, is obtained with very good accuracy (Er ≤ 6.1%) and reproducibility (RSD ≤ 4.1%) in the concentration range assayed
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Google Scholar:Blanco Gil, Elías
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Martínez, José I.
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Parra Alfambra, Ana María
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Petit Domínguez, María Dolores
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Del Pozo, María
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Martín-Gago, José A.
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Casero Junquera, María Elena
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Quintana Mani, María del Carmen
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