氮氯共掺杂石墨烯量子点的合成及其对汞离子检测

Synthesis of N-Cl co-doped graphene quantum dots and their application in the detection of mercury ions

以果糖、乙二胺、盐酸为原料,采用水热法将N、Cl原子掺杂在石墨烯量子点上,制备出氮氯共掺杂石墨烯量子点(N,Cl-GQDs),利用透射电镜、X射线光电子能谱、紫外-可见吸收光谱、荧光光谱等手段对其结构和性能进行了表征。结果表明:合成的N,Cl-GQDs为分散效果良好的球形,与单独氮掺杂及未掺杂的石墨烯量子点相比,双元素掺杂石墨烯量子点具有更好的光学性能。同时利用电化学发光淬灭原理构建了传感器,实现了对汞离子的检测,计算得出检测限为0.03ng/mL。

N and Cl atoms were successfully doped on graphene quantum dots by hydrothermal method to prepare N-Cl co-doped graphene quantum dots(N,Cl-GQDs)with fructose,ethylenediamine and hydrochloric acid as raw materials.The structure and properties of the graphene quantum dots were characterized by transmission electron microscopy,X-ray photoelectron spectroscopy,UV-visible absorption spectrum and fluorescence spectrum.The results showed that the synthesized N,Cl-GQDs were spherical with good dispersion effect,and the two-element doped graphene quantum dots had better optical properties than the nitrogen-doped and undoped graphene quantum dots.At the same time,a sensor was constructed based on the electrochemical luminescence quenching principle to realize the detection of mercury ions,and the detection limit was calculated to be 0.03ng/mL.