ZnO-离子液体功能化的石墨烯量子点的制备及荧光性能

Study on preparation and fluorescence property of graphene quantum dots functionalized with ZnO-ionic liquids

利用水热法制备了ZnO-1-丙胺基-3-甲基咪唑氯离子液体功能化的石墨烯量子点溶液,通过紫外-可见吸收光谱、红外吸收光谱和透射电镜对其进行了表征.通过研究各种因素对ZnO-离子液体功能化的石墨烯量子点的荧光发射光谱的影响,发现Cr2O72-对ZnO-离子液体功能化的石墨烯量子点有荧光猝灭现象.实验结果表明,在优化的实验条件下,pH=5.0,Cr(Ⅵ)浓度为1.0×10-7~1.6×10-6 mol·L-1时,Cr(Ⅵ)对ZnO-离子液体功能化的石墨烯量子点的荧光猝灭呈线性,其线性方程为F/F0=0.969 5-0.008 4c,R=0.998 8,检出限为7.6×10-2μmol·L-1.

Graphene quantum dot functionalized with ZnO-1-propylamino-3-methylimidazole chloride ionic liquids was prepared by hydrothermal method and characterized by UV-Vis, FT-IR and TEM. The effect of various factors on the fluorescence emission spectra of ZnO-ionic liquids functionalized graphene quantum dots was studied. It was found that ZnO-ionic liquid functionalized graphene quantum dot would be fluorescence quenched in the present of Cr2O72-. Experimental results showed that the fluorescence quenching of ZnO-ionic liquid functionalized graphene quantum dot solution in the present of Cr6+ is linear over the range from 10.0 to 1.6 μmol·L-1 under pH=5.0, the linear equation F/F0=0.969 5-0.008 4c, R=0.998 8, with the detection limit of 7.6×10-2 μmol·L-1.