洋葱状富勒烯的表面化学修饰

Surface Chemical Modification of Onion-like Fullerenes

采用稀硝酸对洋葱状富勒稀(OLFs)进行了纯化处理,用HRTEM观察了OLFs纯化前后的形态与结构,用TGA技术定量分析了OLFs的纯化效果,然后使OLFs与金属钾在甲苯中回流,并采用FTIR光谱和Ram an光谱对反应前后的OLFs进行了光学性能表征.红外光谱在3 451,1 402和1 039 cm-1处出现了羟基的特征峰,表明形成了OLFs羟基化合物;Ram an光谱中IG/ID的比值增大,说明OLFs的石墨化程度提高,反应前后G峰和D峰的位置无明显区别,表明OLFs的整体结构未发生变化.

Onion-like fullerenes（OLFs） synthesized by chemical vapor deposition（CVD） were purified by dilute nitric acid. The microstructures of OLFs and purification effects were analyzed by TEM and TGA respectively. Then OLFs were refluxed with potassium in toluene and were characterized by using FTIR and Raman spectroscopy. It is found that the wavenumbers at 3 451, 1 402 and 1 039 cm^-1 show characteristic peaks of hydroxyl groups indicating the formation of OLFs（OH） n. The raman results reveal, the ratio of IG/ID increases fore graphitization degree of OLFs is improved and the D line and G line of OLFs have no obvious changes beand after reaction, which indicate that OLFs retain their structures.