On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes
Hokkanen, M., Lautala, S., Shao, D., Turpeinen, T., Koivistoinen, J., & Ahlskog, M. (2016). On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes. Applied Physics A: materials science & processing, 122 (7), 634. doi:10.1007/s00339-016-0154-0
Published inApplied Physics A: materials science & processing
© Springer-Verlag Berlin Heidelberg 2016. This is a final draft version of an article whose final and definitive form has been published by Springer. Published in this repository with the kind permission of the publisher.
Arc-discharge synthesized multiwalled carbon nanotubes (AD-MWNT) have been proven to be of high quality, but their use is very limited due to difficulties in obtaining them in a clean and undamaged form. Here, we present a simple method that purifies raw AD-MWNT material in laboratory scale without damage, and that in principle can be scaled up. The method consists of depositing raw AD-MWNT material on a flat substrate and immersing the substrate slowly in water, whereby the surface tension force of the liquid–substrate contact line selectively sweeps away the larger amorphous carbon debris and leaves relatively clean MWNTs on the substrate. We demonstrate the utility of the method by preparing clean individual MWNTs for measurement of their Raman spectra. The spectra exhibit the characteristics of highquality tubes free from contaminants. We also show how one concomitantly with the purification process can obtain large numbers of clean suspended MWNTs.