Abstract: Carbon dots have many advantages, such as low cost and cytotoxicity as well as good photostability and biocompatibility. The fluorescence and phosphorescence properties as well as applications of carbon dots have always been research plumes. Herein, fluorescence/phosphorescence double-emission carbon dots were prepared via a one-pot hydrothermal method involving 3,4-difluorophenylboric acid as a carbon source. The physicochemical properties of the carbon dots were determined by studying their crystal structure, element composition, and surface electrical charging property. Organic boric acid functional groups can produce boron with a strong affinity for o-hydroxyl groups, thereby quenching the fluorescence signal due to electron transfer. Based on this, carbon dots were applied in the chemical sensing of glucose. The quenching rate ((F0-F)/F0) exhibited a good linear variation in the concentration range of 5—50 μmol/L. Moreover, because of the existence of electron deficient organic boric acid groups on the carbon atoms of 3,4-difluorophenylboric acid, the n-electrons (B-O, n→σ*), through the weak conjugation between them, enabled the solid carbon dots to have good phosphorescence properties and achieve gratifying results when applied in digital coding. Owing to their simple synthesis and good photochemical properties, the 3,4-difluorobenboric acid-derived fluorescent/phosphorescent dual-emission carbon dots showed great application potential in blood glucose sensing and digital coding.
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2023, Vol. 37 
