水热法合成仙人掌荧光碳量子点的研究

Study on the Synthesis of Fluorescent Carbon Dots by Cactus

以仙人掌为碳源,通过水热法合成了荧光碳量子点,并通过荧光光谱对样品的光学性能进行了表征,同时考察了仙人掌用量、水热反应时间和温度对合成荧光碳量子点的影响。结果显示:以仙人掌为碳源合成的荧光碳量子点在水溶剂30 m L条件下,仙人掌质量为0.5 g时得到的荧光碳量子点发光效率最高;同时,水热反应时间为3 h,反应温度为160℃时得到的荧光碳量子点发光强度最高。荧光碳量子点在紫外灯照射下发出明亮的绿光。

Fluorescent carbon dots utilizing cactus as a carbon source via hydrothermal method was developed.Fluorescent carbon dots were characterized by fluorescence spectroscopy. The effect of the amount of cactus,reaction time and reaction temperature on hydrothermal synthesis process was investigated in the present work. The results indicated that when the total volume of the solvent water was 30 m L,0. 5 g of cactus used was optimal because the obtained fluorescent carbon dots showed the highest luminescent efficiency. Besides,the optimized reaction time and temperature were set at3 h and 160 ℃ owing to fluorescent carbon dots with the highest fluorescent intensities. The fluorescent carbon dots can emit bright green photoluminescence under UV excitation.