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Correspondence
Nature Nanotechnology 3, 310 (1 June 2008) | doi:10.1038/nnano.2008.139
Do single-walled carbon nanotubes occur naturally?
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Abstract
To the Editor Although it is generally assumed that carbon nanotubes are naturally occurring, there is surprisingly little evidence to support this assumption. Transmission electron microscope (TEM) images of what appear to be multiwalled carbon nanotubes (MWNTs) isolated from a Greenland ice core have been published, as have images of hollow carbon fibres from oil-well samples, although there remain questions about the validity of this evidence owing to the lack of clear high-resolution TEM images, high-quality diffraction patterns or Raman spectroscopy data.
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