Fraunhofer Institute for Manufacturing Technology and Applied Materials Research (IFAM), Wiener Str. 12, D-28359 Bremen, Germany.
J Colloid Interface Sci. 2011 Jul 1;359(1):311-7. doi: 10.1016/j.jcis.2011.03.069. Epub 2011 Mar 24.
The afterglow of an atmospheric pressure plasma has been used for the fast oxidative functionalization of multi-walled carbon nanotubes (MWCNTs). Scanning electron microscopy and Raman spectroscopy demonstrate that the MWCNT morphology is mostly preserved when the MWCNTs are dispersed in a solvent and injected as a spray into the plasma. Contact angle measurements show that this approach enhances the wettability of MWCNTs and reduces their sedimentation in an aqueous dispersion. X-ray photoelectron spectroscopy, IR spectroscopy, and electrokinetic measurements show that oxygen plasma incorporates about 6.6 at.% of oxygen and creates mainly hydroxyl and carboxyl functional groups on the MWCNT surface. The typical effective treatment time is estimated to be in the range of milliseconds. The approach is ideally suited for combination with the industrial gas phase CVD synthesis of MWCNTs.
大气压等离子体余晖被用于快速氧化功能化多壁碳纳米管（MWCNTs）。扫描电子显微镜和拉曼光谱表明，当 MWCNTs 在溶剂中分散并作为喷雾注入等离子体时，MWCNT 的形态大部分得以保留。接触角测量表明，这种方法提高了 MWCNTs 的润湿性，并减少了它们在水分散体中的沉降。X 射线光电子能谱、红外光谱和电动测量表明，氧气等离子体包含约 6.6 at.% 的氧，并在 MWCNT 表面主要形成羟基和羧基官能团。典型的有效处理时间估计在毫秒范围内。这种方法非常适合与工业气相 CVD 合成 MWCNTs 相结合。
