中药绞股蓝水热合成碳量子点及性能研究

Synthesis and Properties of Carbon Quantum Dots from Gynostemma Pentaphyllum via Hydrothermal Synthesis

以中药材绞股蓝为原材料,一步水热法合成碳量子点,对合成碳量子点的反应条件进行了优化,即水热合成的时间、水热合成的温度和绞股蓝的用量。在最优反应条件下,通过透射电镜、荧光分光光度计、傅里叶变换红外光谱仪和紫外-可见吸收光谱仪对合成碳量子点表征。结果表明:绞股蓝水热合成碳量子点的反应时间为6h、反应温度为200℃、绞股蓝的质量为4 g时荧光强度最高;分布均匀,且没有出现团聚现象,平均粒径为2.3 nm;含有大量含氧官能团,有良好的水溶性;最佳激发波长为310 nm,最佳发射波长为400 nm,发射光的波长和强度不会受激发波长的影响。该合成方法简单,反应条件易控制,成本低,对环境友好,适用于碳量子点的大批量合成。

One-step hydrothermal method is used to synthesize Carbon Quantum Dots(CQDs)with the Chinese herb gynostemma pentaphyllum as the raw material.The reaction conditions of CQDs,namely,the hydrothermal synthesis time,the hydrothermal synthesis temperature and the amount of gynostemma pentaphyllum,are optimized.Under the optimum reaction conditions,the synthesized CQDs are characterized by transmission electron microscopy,fluorescence spectrophotometer,Fourier transform infrared spectrometer and UV-Vis absorption spectrometer.The results show that the highest fluorescence intensity is obtained at a reaction time of 6h,a reaction temperature of 200°C and a mass of 4g of gynostemma pentaphyllum.The CQDs are uniformly distributed,without agglomeration,and the average particle size was 2.3 nm.There are abundant oxygen-containing functional groups on its surface;It contains a large number of oxygen-containing functional groups which has good water solubility;The optimum excitation wavelength is 310 nm and the optimum emission wavelength is 400 nm.The wavelength and intensity of the emission light will not be affected by the excitation wavelength.This method is simple,low-cost and environmentally friendly,therefore it is suitable for mass synthesis of CQDs.