Argon adsorption behavior of multi-walled carbon nanotubes with different diameters
Multi-walled carbon nanotubes (MWCNT) with two different average diameters were purified with the nitric acid (MWCNT-HNO3) treatment process. The N2 (adsorption/desorption) measurement showed an increase in surface area from the raw material to the MWCNT 4 normal (4N) acid (HNO3) treatment material, and a decrease in surface area from the MWCNT-4N acid treatment material to the MWCNT-8N acid treatment material. Transmission electron microscopy (TEM) analysis implies that some amorphous carbons have been removed from the treated samples and defects on the sidewalls were observed.