氧化石墨烯表面稀土改性机理

摘要

石墨烯独特的物理、化学和力学性能为复合材料的开发奠定了重要基础,是各种复合材料的理想增强体,但石墨烯分散性和湿润性差的问题严重限制了其在复合材料中的进一步应用.采用浸润法和加热改性剂法制备了稀土改性氧化石墨烯(RE-M-GO),利用X射线衍射(XRD)和扫描电子显微镜(SEM),能谱仪(EDS)对 RE-M-GO 的形貌和相结构进行表征;并结合傅里叶变换红外(FTIR)和紫外光谱仪器(UV),分析改性氧化石墨烯的官能团结构的变化,探讨其改性机理.结果表明:稀土改性的氧化石墨烯的分散性有明显的改善,主要是由于稀土元素与氧化石墨烯的含氧官能团进行反应形成配位键,生成了新的官能团,降低了氧化石墨烯的界面能及表面能,从而改善了氧化石墨烯的分散性.%Graphene is an ideal reinforcement for various composites for its unique physical,chemical and mechanical properties.However,the problem of graphene dispersibility and poor wettability se-verely limits its further development in composites application.(RE-M-GO)were prepared by impreg-nation method and heating modifier method.The morphology and phase structure of RE-M-GO were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The changes of functional groups of modified graphene oxide were analyzed by means of Fourier transform infrared (FTIR),optical spectra(UV)and energy dispersive spectrometer(EDS),and the modification mech-anism was also discussed.The results show that the dispersibility of rare earth modified graphene ox-ide is obviously improved due to the reaction of rare earth elements with the oxygen-containing func-tional groups of graphene oxide to form coordination bonds,resulting in a new functional group, which reduces the interfacial energy of graphene oxide and surface energy,thereby the dispersion of graphene oxide is improved.