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为制备碳量子点水分散性良好的碳量子点,采用改进的Hummers法,以石墨为碳源,制备氧化石墨烯,并对氧化石墨烯进行超声分散法,制备得到10~20nm的碳量子点,进一步分析使用超声分散法调控碳量子点的尺寸大小.通过透射电镜、拉曼、红外光谱仪、动态光散射仪、荧光光谱仪分析碳量子点的形貌、官能团、粒径大小及荧光强度.结果表明,所制备得到的氧化石墨烯具有很好的水分散性,通过对氧化石墨烯进行超声分散处理,能较好的将其破碎剥离,可批量制备得到粒径大小不同的碳量子点,且所得到碳量子点的水分散性较好.
In order to prepare carbon quantum dots with good water dispersibility of carbon quantum dots, a modified Hummers method was used to prepare graphene oxide by using graphite as a carbon source and an ultrasonic dispersion method of graphene oxide to prepare a carbon quantum dot with 10-20 nm , Further analysis of the use of ultrasonic dispersion method to control the size of carbon quantum dots size.The morphology, functional groups, particle size and fluorescence intensity of carbon quantum dots were analyzed by transmission electron microscopy, Raman, infrared spectroscopy, dynamic light scattering instrument, fluorescence spectrometer results It shows that the obtained graphene oxide has good water dispersibility. By gravimetrically dispersing graphene oxide, the graphene oxide can be crushed and peeled off, and carbon quantum dots with different particle sizes can be prepared in batches, and The resulting carbon quantum dots have better water dispersibility.