1. Carbon quantum dots with ultra-high quantum yield for versatile turn-on sensor of gluten and cyanide Ions.
- Author
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Oliveira, J.J.P., Carneiro, S.V., Carvalho, E.F., Rodrigues, V.S.F., Lima, F.E.H., Matos, W.O., Fechine, L.M.U.D., Antunes, R.A., Neto, M.L.A., Campos, A.T.P., Moura, T.A., Cesar, C.L., Santos-Oliveira, R., Carvalho, H.F., Paschoal, A.R., Freire, R.M., Carvalho, C.J.R., and Fechine, P.B.A.
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QUANTUM dots , *QUANTUM dot synthesis , *CYANIDES , *GLUTEN , *POISONS , *SENSOR arrays - Abstract
In this work, we reported the synthesis of carbon quantum dots (CQDs) with high fluorescent quantum yield (90.7 %). These nanoparticles were applied in a turn-off/turn-on sensor able to detect cyanide ions. In this sensing strategy, Fe3+ ions were added to the aqueous suspension of CQDs to quench the fluorescence of the system, which was recovered from the presence of cyanide ions. Furthermore, a sensor array was developed using the LDA chemometric tool, to classify different species present in cookie formulations, including gluten. The turn-off/turn-on sensor proved to be sensitive and effective for detecting cyanide ions, with a detection limit of 3.77 ppm. This high sensibility and selectivity allowed quantifying the analyte in a real sample of tap water. [Display omitted] • A fluorescent nanoprobe with ultra-high quantum yield (90.7 %) for sensing of allergens and toxic substances was obtained. • Carbon Quantum Dots (CD-90) synthesized by one-step hydrothermal treatment and showed high fluorescence signal at 440 nm. • CD-90 were used as fluorescent nanoprobes in the construction of a sensor array for detection of gluten in cookies samples. • Fe3+ ions quenched the fluorescence of CD-90, which was recovery by adding CN − ions. • CN − ions were identified in tap water sample with recovery of 94.8 % and RSD of 7.34 %. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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