论文部分内容阅读
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。
For the first time, petroleum coke, a by-product of the refining industry, was used as a carbon source to prepare water-soluble carbon quantum dots (CQDs) with uniform particle size, good dispersibility, excitation dependence and upconversion performance by using ultrasonic and chemical oxidation methods. The effects of reaction temperature and reaction time on the fluorescence properties of CQDs were investigated. The optimal technological parameters of CQDs were analyzed by fluorescence spectroscopy. The microstructure, morphology, surface functional groups, etc. of CQDs were investigated by TEM, XRD, Raman and FT-IR Were characterized by UV-Vis absorption and fluorescence spectra of its fluorescence properties, and CQDs of the fluorescence emission mechanism was discussed. The results showed that the optimal reaction temperature was 120 ℃ and the reaction time was 12 h. The average particle size of the prepared CQDs was about 5 nm with some degree of crystallinity and surface defects, and the surface was rich in oxygen Functional group, yellow-green fluorescence, fluorescence quantum yield of 1.6%, good fluorescence. The CQDs have good application prospects in the fields of photocatalysis, photoelectric conversion and biological imaging.