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Multi walled carbon
nanotubes- Arc process- $200/gram. Diameter 5-15 nm.Length 2 microns.
Raman spectra 98% sp2.
Single walled carbon nanotubes- Nanohorns- $500/gram
2 to 3 nm. in diameter and 30 to 50 nm. in length with a 19 degree horn at their ends. They form into clusters
with a diameter of about 30 to 120 nm.