以桃花为碳源,通过水热法一步合成水溶性荧光碳点.探究了水热温度、水热时间和桃花添加量等因素对碳点荧光性能的影响.分别用紫外吸收光谱(UV)、荧光发射光谱(PL)、高分辨透射电子显微镜(HRTEM)、红外吸收光谱(FTIR)和拉曼光谱(RAMAN)表征了碳点的光学性质、分散性及表面结构等情况.制备的碳点,尺寸集中分布在4.4±0.8nm的直径区间,在水中有非常好的分散性.碳点溶液在紫外灯照射下可以发出明亮的蓝色荧光,且具有较高的荧光量子产率(26％).本文还讨论了该方法制备碳点的荧光机理.
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