边缘氧化对石墨烯水分散性能的影响
Effect of Edge Modification on Water Dispersibility of Graphene Nanosheets
王子元 1佟钰 1王雨凡1
作者信息
- 1. 沈阳建筑大学 材料科学与工程学院,辽宁 沈阳 110168
- 折叠
摘要
为改善石墨烯的水分散性,将石墨烯粉碎后置于高锰酸钾(KMnO4)与硫酸的混合水溶液中低温处理1～4 h,尝试通过一种较温和的氧化方式在石墨烯表面尤其是边缘位置引入含氧集团,调整表面极性;研究中,用紫外-可见光分光光度计评价边缘氧化石墨烯在水中的分散性和稳定悬浮能力,用拉曼光谱、X射线衍射仪、扫描电镜对样品进行微观结构表征.结果表明:KMnO4用量为石墨烯质量的30%、硫酸质量分数70%、冰水浴反应3.5 h时,边缘氧化石墨烯的水分散性能最佳,且氧化处理过程不会过度破坏石墨烯的片层结构,使其仍表现出石墨烯的理化特性.
Abstract
With a purpose of upgrading the water dispersibility of graphene,graphene nanosheets was pulverized and mixed into the aqueous solution of KMnO4 and sulphoric acid,following by a process of controlling oxidization for 1～4 h in an ice water bath.The oxidization process with relative mild degree introduced oxygen-containing groups onto the surface especially edge of the graphene nanosheets,and thus gave rise of the surface modification of the graphene.A UV-Vis spectrometer was employed to determine the water dispersibility and suspension stability of the edge-modified graphenes,while Raman Spectrum,X-ray Diffraction and Scanning Electron Microscope were used to characterize the microstructure of such graphenes.The experimental results showed that KMnO4 in a mass ratio of 30%regarding to that of graphene,the mass fraction of sulfuric acid in 70%,and the reaction time of 3.5 h in ice water bath were the most favorite to improve the water dispersibility of edge-modified graphenes,and the controllable oxidization process did not damage the layered structure of edge-modified graphenes and thus resulted in similar physical/chemical performances to that of original graphenes.
关键词
石墨烯/边缘氧化/分散性Key words
Graphene/Edge oxidation/Water dispersion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据