(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 对多壁碳纳米管(MWNTs)分别进行干式球磨和湿式球磨，采用TEM、XRD、XPS和Raman光谱等方法分析球磨对MWNTs形貌和结构的影响。结果表明：MWNTs在磨球的冲击作用下产生弯曲、扭结，形成结构缺陷；MWNTs容易在缺陷处断裂，产生大量敞开的断口，这些断口形态可发生转化；与干式球磨比较，湿式球磨后MWNTs的长度较平均，多数端部处于敞开状态，且其结构的损坏程度较小；MWNTs的分散状态及其断口结构的稳定性是影响球磨效果的重要因素。
关键字: 碳纳米管；球磨；分散；悬键
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The multi-walled carbon nanotubes (MWNTs) were treated by dry ball milling and wet ball milling, respectively. The morphological and structural characteristics of MWNTs were investigated using TEM, XRD, XPS and Raman spectrum. The results show that the fracture of MWNTs occurs easily at the sites of structural defects, such as bends and kinks, which fractures easily at defect. The new tips generated from fracture of MWNTs are mainly open and their morphologies may transform due to metastable structure. Compared with the dry-milled MWNTs, the wet-milled MWNTs seem to be more uniform in length, with more open tips and lower degree of structural collapse. The improved characteristics of the wet-milled MWNTs may be attributed to the effects of the milling media on both the dispersion of MWNTs and the morphological evolution of new tips.
Key words: carbon nanotubes; ball milling; dispersion; dangling bonds
