石墨氧化过程中官能团及结构的变化

Changes of Groups and Structure on Oxidation Process of Graphite

摘要:

采用Hummers法，通过改变中温氧化时间研究了石墨氧化过程中官能团和结构的变化.结果表明：随着中温氧化时间的增加，含氧官能团的增加以C—O为主，其次为CO和O—CO；C—O主要出现在氧化前期，而CO则主要出现在氧化后期；氧化过程中，片层的颜色从边缘开始，由黑色逐渐向金黄色转变；随着中温氧化时间的增加，石墨在层间距被打开的同时，其面内晶格结构逐渐遭到破坏，无序程度逐渐增大，氧化前期对面内晶格结构的破坏较为严重.

Abstract:

Based on Hummers’ method, the changes of groups and structure on oxidation process were discussed by modifying the oxidation time at the medium temperature. The results show that the content of oxygen containing groups increases gradually, especially the C—O bond, followed by CO and O—C=O bond; C—O bond emerges at the beginning of the oxidation, and the CO bond emerges mainly in the late stage of oxidation. The oxidation reaction occurs from the edge to the middle, corresponding to the color of graphite oxide's gradual changes from black to yellow. Throughout the oxidation process, with the increasing of distance between graphite layers, the structure of in place lattice is destroyed and the disorder increases gradually. The early oxidation damage to the in place lattice structure is more serious.