Institute of Materials and Systems Engineering, MingDao University, ChangHua, Taiwan.
Nanoscale Res Lett. 2008 Dec 16;4(3):234-9. doi: 10.1007/s11671-008-9231-4.
High incident energy hydrogen and/or oxygen cations are generated by electron cyclotron resonance system, and then used to highly efficiently modify multi-walled carbon nanotubes (MWCNTs). The effects of various H2/O2 gas compositions on the modification process are studied. A systematic characterization method utilizing a combination of X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, Raman spectroscopy, and thermogravimetric analysis (TGA) is used to evaluate the effects of various H2/O2gas compositions on MWCNT functionalization. The Raman results show that the ID/IG ratio is directly affected by H2 concentration in gas mixture, and the treatment applying a H2/O2 gas mixture with ratio of 40/10 (sccm/sccm) can yield the nanotubes with the highest ID/IG ratio (1.27). The XPS results suggest that the gas mixture with ratio of 25/25 (sccm/sccm) is most effective in introducing oxygen-containing functional groups and reducing amorphous carbon. The TGA suggests that the structural change of the treated nanotubes is marginal by this method with any gas condition.
高能氢和/或氧离子由电子回旋共振系统产生，然后用于高效地修饰多壁碳纳米管（MWCNTs）。研究了各种 H2/O2 气体组成对修饰过程的影响。采用 X 射线光电子能谱（XPS）、扫描电子显微镜、拉曼光谱和热重分析（TGA）相结合的系统表征方法，评估了各种 H2/O2 气体组成对 MWCNT 功能化的影响。拉曼结果表明，ID/IG 比值直接受到气体混合物中 H2 浓度的影响，在 H2/O2 气体混合物比例为 40/10（sccm/sccm）的处理条件下，可以得到具有最高 ID/IG 比值（1.27）的纳米管。XPS 结果表明，在任何气体条件下，比例为 25/25（sccm/sccm）的气体混合物最有效地引入含氧官能团并减少非晶碳。TGA 表明，用这种方法处理后的纳米管的结构变化很小。
