摘要
首次以炼油行业的副产品石油焦为碳源,采用超声法和化学氧化法制备出粒径均一、分散性良好,具有激发依赖性和上转换性能的水溶性碳量子点(CQDs)。考查了反应温度、反应时间对CQDs荧光性能的影响,借助于荧光光谱分析优选合成CQDs的工艺参数,采用TEM、XRD、Raman、FT-IR对CQDs的微观组成结构、形貌尺寸、表面官能团等进行了表征,借助紫外-可见吸收光谱和荧光光谱研究其荧光性能,并对所制CQDs的荧光发光机理进行了探讨。结果表明,反应温度为120℃,反应时间为12 h是制备CQDs的较优工艺参数,所制CQDs的平均粒径为5 nm左右,有一定的结晶度和表面缺陷,表面有丰富的含氧官能团,发黄绿色荧光,荧光量子产率为1.6%,荧光性能良好。该CQDs在光催化、光电转换、生物成像等方面具有良好的应用前景。
The water soluble carbon quantum dots （CQDs） were prepared from petroleum coke by ultrasonic and chemical oxidation methods. The obtained CQDs had good dispersion, uniform particle size, emission dependence, and upconversion fluorescence properties. The suitable reaction parameters including reaction temperature and reaction time were obtained by employing the fluorescence spectrum analysis on CQDs. SEM, XRD, Raman and infrared spectrum were used to analyze the microstructure, morphology, size, and surface functional groups of CQDs. The fluorescence properties of CQDs were studied by ultraviolet-visible absorption spectrum and fluorescence spectrum. Finally, the fluorescent light-emitting mechanism of CQDs was discussed. The results showed that the reaction temperature of 120 ~C, the reaction time of 12 h were the optimal preparation parameters of CQDs. The prepared CQDs had a certain degree of crystallinity and surface defects, while the mean particle size was 5 nm. Lots of oxygen containing functional groups were found on the surface, and the fluorescence quantum yield was 1.6%. The obtained CQDs with yellow green fluorescence have good application future in the fields of photocatalysis, photoelectric conversion, biological imaging, etc.
出处
《炭素技术》
CAS
北大核心
2014年第2期16-20,29,共6页
Carbon Techniques
