(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 對多壁碳納米管(MWNTs)分別進(jìn)行干式球磨和濕式球磨，采用TEM、XRD、XPS和Raman光譜等方法分析球磨對MWNTs形貌和結(jié)構(gòu)的影響。結(jié)果表明：MWNTs在磨球的沖擊作用下產(chǎn)生彎曲、扭結(jié)，形成結(jié)構(gòu)缺陷；MWNTs容易在缺陷處斷裂，產(chǎn)生大量敞開的斷口，這些斷口形態(tài)可發(fā)生轉(zhuǎn)化；與干式球磨比較，濕式球磨后MWNTs的長度較平均，多數(shù)端部處于敞開狀態(tài)，且其結(jié)構(gòu)的損壞程度較小；MWNTs的分散狀態(tài)及其斷口結(jié)構(gòu)的穩(wěn)定性是影響球磨效果的重要因素。
關(guān)鍵字: 碳納米管；球磨；分散；懸鍵
（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
