基于臭氧纳米气泡的羟基化石墨烯制备及结构表征

Synthesis and Structural Characterization of Hydroxylated Graphene Based on Ozone Nanobubbles

采用分散剂加超声的手段对天然鳞片石墨进行剥离得到石墨烯,然后分别经常规臭氧(O_(3))氧化和水力空化形成的臭氧纳米气泡(O_(3)NBs)氧化处理制备羟基化石墨烯(G-OH)并进行对比。通过原子力显微镜、zeta电位、X射线光电子能谱及拉曼光谱测试对样品进行了结构、形貌、电位及谱学分析。结果表明,经两种氧化方式处理后的石墨烯薄片厚度为3~4 nm;经O_(3)氧化处理后的石墨烯表面官能团与未经处理石墨烯相似;与O_(3)相比,O_(3)NBs的氧化效能更高,经其处理后的石墨烯羟基化程度更高,同时在石墨烯的芳香环中引入了少量羰基,使得O_(3)NBs制备的G-OH同时具有羟基和羰基功能。

To prepare hydroxylated graphene(G-OH),natural flake graphite was first treated with ultrasound in the presence of dispersant to obtain graphene via liquid phase stripping,which was subsequently oxidized with conventional ozone(O_(3))oxidation or ozone nanobubbles(O_(3)NBs)generated by hydraulic cavitation.The structure,morphology,potential and spectroscopy of the samples were analyzed through atomic force microscopy,zeta potential,X-ray photoelectron spectroscopy and Raman spectroscopy.The results show that the thickness of the graphene flakes treated under these two oxidation modes is 3-4 nm;the functional groups on the surface of O_(3)oxidized graphene are similar to those of untreated graphene.Compared with O_(3),the oxidation efficiency of O_(3)NBs is higher,and the O_(3)NBs treated graphene has a greater degree of hydroxylation with the introduction of a small number of carbonyl groups on the aromatic ring of graphene,so that the G-OH prepared by O_(3)NBs has both hydroxyl and carbonyl functions.