石墨烯在强激光作用下改性的拉曼研究

Raman spectrum research on graphene modification under high intensity laser

采用化学气相沉积法制备了不同层数的石墨烯样品.根据石墨烯透过率曲线分析石墨烯样品层数与550 nm处透过率关系的同时,利用拉曼光谱法分析了不同层数石墨烯样品在强激光辐照下的损伤特性.结果表明:单层石墨烯样品经强激光辐照后,G带和2D带均向高频移动;多层石墨烯样品经强激光辐照后只有G带发生了略微的频移;石墨烯样品拉曼光谱G带与2D带强度比值表征了石墨烯的层数,此比值随激光辐照时间的增加而减小,这表明强激光对石墨烯样品具有明显的剥离现象.

The graphene samples with different numbers of layers are prepared by chemical vapor deposition, the relation between the number of graphene layers and the transmission at 550 nm is analyzed by graphene transmission spectrum. Besides, the damage characteristics of graphene under high intensity laser irradiation are analyzed. The results show that under the laser irradiation, for the single layer graphene, G band and 2D band shift toward high frequeney but for the multilayer graphene, only G band shifts a litile; the ratio between intensities of G band and 2D band in Raman spectrum characterizes the number of graphene layers, and it increases with the irradiated time, so the high intensity laser can peel the graphene.