电化学刻蚀制备的荧光碳纳米颗粒

以纯石墨作电极、乙二胺四乙酸二钠溶液作电解液制备了具有荧光性质的碳纳米颗粒。利用紫外-可见分光光度计和荧光分光光度计分析了碳纳米颗粒的光吸收和荧光发射特征,利用透射电镜和电子能谱分析了碳纳米颗粒的尺寸、晶体状态和成分。结果表明,碳纳米颗粒仅有几纳米,呈分散状态;在325 nm附近具有强的光吸收并表现出强的蓝光发射特征。研究了电解质溶液的种类、浓度等对碳纳米颗粒荧光发射的影响,讨论了碳纳米颗粒的荧光发射机理。

Synthesis of Fluorescent Carbon Nanoparticles by Electrochemistry Etching

The fluorescent carbon nanoparticles were synthesized by electrochemistry etching graphite electrode using the ethylene diamine tetraacetic acid disodium salt solution as the electrolyte.The properties of the light absorption and fluorescence emission of carbon nanoparticles were obtained by electrochemistry etching and were characterized by UV-Vis absorption and fluorescence spectrophotometers.The crystal characterizations and compositions of the obtained carbon nanoparticles were investigated by employing the transmission electron microscope and energy disperse spectroscopy.The results show that carbon nanoparticles with several nanometers are dispersive and exhibit the strong absorption at 325 nm and the bright blue light emission.The effects of the electrolytic solutions and concentrations on the light emissions from carbon nanoparticles were also studied.Finally,the origin of the light emission from carbon nanoparticles obtained by electrochemistry etching was proposed.