“锥形嵌套”结构CN_x纳米管的生长机理及拉曼光谱研究

Growth mechanism and Raman spectroscopic study of “interlinked-cone" shaped CN_x nanotubes

在氮气、氢气以及氯化铵热解产生的氨气环境下 ,以钴作为催化剂 ,在 780℃— 94 0℃温度范围内使二甲苯与二茂铁受热分解 ,合成了CNx 纳米管 .在高分辨率透射电子显微镜下观察 ,合成的纳米管呈现“锥形嵌套”的形貌特征 .从不同结构的分子面形成能的角度探讨了CNx 纳米管的催化生长机理 .不同温度下所制备样品的拉曼光谱研究表明 ,ID IG 值可以反映氮的掺杂所带来的纳米管结晶有序程度的降低 。

CNx nanotubes have been generated by thermal decomposition of ferrocene/xylene over cobalt powder at 780degreesC-940degreesC in an atmosphere of N-2,N- H-2 and NH3 released from NH4Cl pyrolyzing at 300degreesC. The high-resolution transmission electron microscope (HRTEM) images show that the tubes consist of unusual 'interlinked-cone'. The catalytic growth mechanism of CNx nanotubes is discussed based on the formation energy of different structures. Raman spectroscopic studies show that the I-D/I-G ratio represents the crystallinity of the CNx nanotubes. The shift of the Raman band to higher frequencies confirms the nitrogen incorporation.