作　　者： ; ; ; ; ; ;

机构地区： 汕头大学

出　　处： 《功能材料》 2007年第11期1893-1897,共5页

摘　　要： 以Ni：Cr=3：1的双金属层作为催化剂，用C2H2为碳源气体利用化学气相沉积（CVD）法，在不同的温度下制备纳米碳管。扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究制备产物发现：当制备温度高于900℃时，没有纳米碳管生成，制备温度在700-800℃之间纳米碳管中填充有一些离散分布的金属Ni纳米线，制备温度在650℃有纳米碳管生成，但是纳米碳管中没有发现纳米线的填充。通过高分辨透射电子显微镜（HRTEM）分析发现，纳米线是以液态或是粘滞液态填充进纳米碳管。根据实验结果，提出了一个在本实验条件下纳米线填充进纳米碳管的气-液／固-固V-L／S-S（vapor-liquid／solid-solid）模型，这个模型能解释一些传统的V-L-S（vapor-liquid-solid）模型不能解释的实验现象。 MWCNTs were prepared with the help of Ni-Cr alloy （Ni ： Cr=3 ： 1） as catalyst in a thermal chemical vapor deposition system by thermally decomposing acetylene at different temperature. SEM and HRTEM have been used to study the CNTs prepared at a temperature range of 650-900℃. Only the MWCNTs synthesized within the temperature range of 700-800℃ were filled with metal Ni single crystal nanoparticles or nanowires. No nanoparticles or nanowires were found in the cavity of prepared CNTs if the growing tempera- ture was low down 650℃ while even no CNTs were synthesized if the growing temperature is high up to 900℃. From the shape of nanoparticle inside the CNT it is concluded that the metal Ni must be liquid when the CNTs were synthesized. A Vapor-Solid/Liquid-Solid （V-L/S-S） growth mechanism is proposed. This V-L/S-S model can explain some experimental phenomena very well, which cannot be explained by traditional Vapor-Liquid- Solid （V-L-S） model.

关 键 词： 纳米碳管 纳米线 模型

领　　域： [理学] [理学] [一般工业技术]