通过一种简便直接的策略来制备高荧光碳量子点(CDs)。该碳量子点以黄花倒水莲叶为碳源,通过一步水热法合成。合成的碳量子点发出明亮的蓝色荧光,在385nm激发下于461nm处有强发射峰。这些碳量子点不仅具有优异的光致发光性能和水溶性,还可作为一种多功能荧光传感器,用于高灵敏度和选择性的Ag⁺检测探针。此外,该荧光探针的猝灭效率在0～20μmol/L范围内的Ag⁺浓度呈现良好的线性关系(R²=0.9901),检测限低至0.74μmol/L。该方法适用于实际水样中的检测,回收率为96.3～100.2%,是一个极具发展前景的检测体系。

This paper presented a simple and straightforward strategy for the preparation of highly fluorescent carbon quantum dots (CDs).These carbon quantum dots were synthesized by a one-step hydrothermal method using the leaves of polygala fallax hemsl as the carbon source.The synthesized carbon quantum dots emitted bright blue fluorescence and had a strong emission peak at 461nm under 385nm excitation.These carbon quantum dots not only possessed excellent photoluminescence properties and water solubility but could also serve as a multifunctional fluorescent sensor and be used as a probe for the highly sensitive and selective detection of Ag⁺.In addition,the quenching efficiency of this fluorescent probe exhibited a good linear relationship with the Ag⁺ concentration in the range of 0～20μmol/L(R²=0.9901),and the detection limit was as low as 0.74μmol/L.This method was applicable to the detection in actual water samples,with a recovery rate of 96.3～100.2%,making it a highly promising detection system.