石墨烯量子点: 制备及检测乙醇-水溶液组分
Graphene quantum dots: Preparation and detection of ethanol content in an aqueous solution

采用改进的非完全脱水碳化方法制备石墨烯量子点. 产物尺寸约6 nm, 激发峰355 nm, 发射峰458 nm. 基于乙醇对石墨烯锯齿边质子化的抑制效应, 发现可通过石墨烯量子点荧光光强检测乙醇-水混合溶液组分. 在0.01 - 100%范围内, 乙醇体积百分比与发射峰光强增量呈线性关系. 本研究为制备石墨烯量子点提供参考, 提出了简易的较宽范围的乙醇水溶液含量检测方法.
Improved graphene quantum dot preparation method based on incomplete carbonization of citric acid was developed. X-ray powder diffraction demonstrates the formation of graphene structure. The produced quantum dots have an average particle size of approximately 6 nm. The wavelengths of excitation, emission, and uv-visible absorption peaks are 355, 458, and 360 nm, respectively. Because ethanol may inhibit the protonation of the zigzag sites of graphene quantum dots, protecting the emissive triple carbine and active quantum dot fluorescence states, its content in water can be estimated by the fluorescence intensity of the quantum dots. In the scope of 0.01 to 100%, the ethanol volume ratio increases linearly with increasing fluorescence intensity at the emission peak with a fluorescence-to-volume ratio constant of about 0.125. This research provides reference information for graphene quantum dot preparation. And it also presents a facile method to measure the ethanol content in water at a relatively wide range.