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研究了用热解柠檬酸制备发蓝光的石墨烯量子点(GQDs),并在此基础上,用(NH4)2CO3作N源,在水热条件下制备N掺杂石墨烯量子点(N-GQDs)。通过透射电子显微镜(TEM)、X射线光电子能谱仪(XPS)、傅里叶红外光谱仪(FT-IR)、紫外-可见吸收光谱仪(UV-Vis)、荧光光谱仪等对样品的结构和光学性能进行表征。此外,基于荧光淬灭原理,利用N-GQDs构建了一种检测Fe3+的荧光探针。研究表明,N-GQDs的荧光强度随Fe3+浓度的增大而降低,在0~60μmol/L范围内,N-GQDs荧光强度与Fe3+浓度有较好的线性关系,且该探针的检测限低达0.925μmol/L。
The preparation of blue light-emitting graphene quantum dots (GQDs) by pyrolysis of citric acid was studied. On the basis of this, (NH4) 2CO3 was used as N source to prepare N-doped graphene quantum dots (N- GQDs). The structure and optical properties of the samples were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy and fluorescence spectroscopy Characterization. In addition, based on the fluorescence quenching principle, a fluorescent probe for detecting Fe3 + was constructed by using N-GQDs. The results showed that the fluorescence intensity of N-GQDs decreased with the increase of Fe3 + concentration. There was a good linear relationship between the fluorescence intensity of N-GQDs and Fe3 + concentration in the range of 0 ~ 60μmol / L, and the detection limit of this probe was low Up to 0.925 μmol / L.