Single-walled Carbon Nanotube SWCNTs Functional Groups Grafting
Planting various functional groups on nanotube walls forms an extensive and important branch of nanochemistry of carbon nanotubes. Such a process can be performed by long-term treament of tubes in acids, where the behavior of single walled tubes was shown to depend on the method of their systhesis. Functional groups can be removed from the tube's walls by heating to temperatures above 623K.
An assumption that protonation of single walled carbon nanotubes is associated with the formation around a tube of an acidic layer that promotes its subsequent dissolution, was confirmed. XDS studies have shown that carbon nanotubes can serve as templates for sulfuric acid crystallization. This fact is considered as a direct evidence of its protonation.
The use of carbon nanotubes involves preparation of their uniform dispersions. For single walled nanotubes, this can be achieved by either wrapping the tubes with polymers, e.g.,polyvinylpyrrolidone and poly,or by protonation of nanotubes with superacids.
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