Peanut-derived carbon dots as a fluorescence probe for the determination of fluazinam and temperature

In consideration of the potential threat, the establishment of efficient approach for fluazinam determination is necessary. Based on the superior property of carbon dots and biomass, sulfur doped biomass-based carbon dots (SBCDs) were constructed using a simple hydrothermal approach, in which peanuts were applied as carbon sources with the addition of methionine. The well-dispersed SBCDs displayed optimal emission wavelength of 435 nm under the excitation wavelength of 364 nm. Owing to the detection principle of fluorescence quenching through static quenching and inner filter effects, the SBCDs were used to detect fluazinam with a broad linear range of 0-100 μM and a detection limit of 0.026 μM. Additionally, the SBCDs also exhibited temperature sensing with a wide linear range of 15-95 °C. Moreover, the as-prepared SBCDs were effectively used for the determination of fluazinam in tap water and orange juice samples. The SBCDs displayed tremendous potential for the sensing of fluazinam and temperature.