乙醇胺稳定石墨烯分散体系的制备及pH响应性能研究

Preparation of graphene dispersing system stabilized by ethanol amine and its pH-response property

摘要:

利用乙醇胺作为分散剂，水合肼为还原剂制备出了一种稳定的石墨烯分散体系。采用紫外可见光谱、红外光谱、X射线衍射、透射电子显微镜、扫描电子显微镜和原子力显微镜等方法对石墨烯水溶液的分散性和pH响应性能进行了分析表征。结果表明，在还原反应后，乙醇胺可修饰在还原氧化石墨烯表面，形成乙醇胺和石墨烯的复合物（ETA-RGO），得到稳定均匀的ETA-RGO分散溶液，原子力和透射电镜显示石墨烯以单片层形式分布，最大宽度为1 μm左右，厚度约为0.8 nm。此外，在pH值降低至6以下时，ETA-RGO分散液中的石墨烯快速团聚，表现出明显的pH响应特性。这种分散体系不仅实现了石墨烯在水溶液中的稳定分散，而且还赋予了石墨烯pH响应性能，可望扩展石墨烯相关材料在生物领域中的应用范围。

Abstract:

A stable graphene dispersing system was prepared by using ethanol amine as dispersant and hydrazine hydrate as reductant. UV-vis spectroscopy (UV-vis), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the dispersion and pH-response properties of the system. The results show that the graphene can be modified by ethanol amine to form the composite (ETA-RGO), leading to a stable and uniform graphene dispersion. AFM and TEM show that the maximum width of graphene in the system is about 1 μm, and the thickness is about 0.8nm. In addition, graphene tended to agglomerate when the pH value of the system was decreased to 6. This system can not only disperse graphene in aqueous solution, but also endow graphene with pH-response property. It is expected to extend the application range of graphene related materials in the biological field.