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本实验以新疆五种不同产地的煤炭为原料,采用酸煮回流法分别制备了五种碳量子点(CQDs)。通过荧光光谱对比分析,巴里坤煤样所制备的CQDs荧光性能最佳。利用透射电子显微镜(TEM)、X射线衍射光谱(XRD)、傅里叶变化红外光谱(FTIR)、紫外可见吸收光谱(UV/vis)、荧光光谱(PL)等对巴里坤煤样所制备的CQDs进行进行结构和光学性能的表征。结果表明,制备的CQDs分散性良好,平均尺寸2.3 nm且具有良好的水溶性,在紫外区有很强的吸,可以发出黄色荧光。研究发现,基于微量金属离子对CQDs的猝灭作用,所制备的CQDs可应用于微量金属离子的探测。
In this experiment, five kinds of carbon quantum dots (CQDs) were prepared respectively from the coal in five different producing areas in Xinjiang by acid reflux method. By fluorescence spectroscopy comparative analysis, Balikun coal samples prepared CQDs fluorescence best. The microstructure and mechanical properties of Barekun coal samples were characterized by means of TEM, XRD, FTIR, UV / vis, CQDs were characterized for structural and optical properties. The results show that the prepared CQDs disperse well, the average size of 2.3 nm and has good water solubility, strong absorption in the ultraviolet region, can emit yellow fluorescence. The study found that based on the quenching effect of trace metal ions on CQDs, the prepared CQDs can be applied to the detection of trace metal ions.