以乙二醇和丙三醇为碳源, 用一元醇(异丙醇和乙醇)为对比, 通过溶剂热法制备得到碳点。通过傅里叶红外光谱、紫外-可见吸收光谱和激发光谱对所制得的碳点进行表征和分析, 探讨了不同碳源对碳点的表面官能团、荧光性能等的影响, 从而分析其荧光的发光机理。结果表明: 乙二醇与丙三醇制备的碳点含有CC键和CO键, 均在365 nm光激发后在450 nm处有荧光峰; 而一元醇是由C—OH基团中的孤对电子产生荧光, 碳源分子中羟基含量对碳点的荧光性能有很大影响, 羟基含量越高, 越容易形成双键结构。

Using ethylene glycol (EG) and glycerol (GL) as the carbon source and monobasic alcohol (isopropanol(IPA) and ethanol(ET)) as the comparison, the carbon dots(CDs) were synthesized by solvothermal method. CDs were characterized and analyzed by Fourier transform infrared spectra, UV-visible absorption spectra and fluorescence spectra. The effects of different carbon sources on the fluorescent properties and surface functional groups of CDs were discussed, so as to analyze their fluorescence performance. The results show that CDs prepared by using EG or GL as carbon source contain CC and CO bonds. The obtained CDs showed a strong emission at the wavelength of 450 nm, with an optimum excitation of 365 nm. The analysis showed that monobasic alcohols lie on the lone pair electrons of C—OH groups to produce fluorescence, indicating monobasic alcohol as a carbon source can not produce carbon dots. The content of hydroxyl has a great impact on the preparation of carbon dots.