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Effect of Water Filling on the Electronic and Vibrational Resonances of Carbon Nanotubes: Characterizing Tube Opening by Raman Spectroscopy

We have shown that water filling has significant effects on the vibrational and electronic properties of SW CNTs, which depend on the diameter and/or chirality of the CNTs. These effects can be used to monitor tube opening easily and quantitatively by Raman spectroscopy on bulk solutions. We found that air oxidation and acid treatment indeed is very effective in opening nearly all of the SW CNTs, but also a simple ultrasonic treatment can open a significant fraction of the CNTs.

carbon nanotubes ; Raman spectroscopy

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