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Effects of Gas Composition on Highly Efficient Surface Modification of Multi-Walled Carbon Nanotubes by Cation Treatment

Tseng, Wen-Shou and Tseng, Chyuan-Yow and Kuo, Cheng-Tzu (2009) Effects of Gas Composition on Highly Efficient Surface Modification of Multi-Walled Carbon Nanotubes by Cation Treatment. Nanoscale Research Letters, 4 (3). pp. 234-239.

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Official URL: http://www.springerlink.com/content/e802tvw711042h...

Abstract

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/O2 gas compositions on MWCNT functionalization. The Raman results show that the I D/I G 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 I D/I G 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.

Item Type:Article
Uncontrolled Keywords:Multi-walled carbon nanotubes - Electron cyclotron resonance plasma - X-ray photoelectron spectroscopy - Functionalization - Raman spectroscopy
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
ID Code:4181
Deposited By:Lesley Tobin
Deposited On:05 Aug 2009 17:11
Last Modified:05 Aug 2009 17:11

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