本文以蜡烛灰为碳源,在强酸环境中超声法一步合成了粒径均匀的荧光碳点(CDs),粒径(3.47±1.81)nm,在紫外灯照射下发出黄绿色荧光.研究表明,CDs表面带有-OH、C=O和-COOH等官能团,存在sp3杂化和sp2杂化两种碳原子.所合成的碳点具有良好的耐光漂白能力和生物相容性,能潜在地作为黄绿色荧光成像试剂应用于细胞成像. In this paper, the gray carbon (CDs) with uniform particle size (3.47 ± 1.81) nm was synthesized by the ultrasonic method in a strong acid environment with yellow candle as the carbon source. The results showed that, CDs have functional groups such as -OH, C = O and -COOH on the surface of CDs, sp3 hybridization and sp2 hybridization exist.The synthesized carbon dots have good lightfastness and biocompatibility and can potentially act as Yellow-green fluorescence imaging reagents for cell imaging.