The synthesis of nitrogen-doped multiwalled carbon nanotubes using an Fe–Co/CaCO3 catalyst S
- N Tetana Z, D Mhlanga S, G Bepete, M Krause R W, J Coville N
- Afr. J. Chem
We report the preparation of write-once-read-many times memory devices using composites of carbon nanotubes and poly(vinyl phenol) sandwiched between Al electrodes. Three types of nanotubes (undoped multiwalled carbon nanotubes, nitrogen-doped multiwalled carbon nanotubes and boron-doped multiwalled carbon nanotubes) are investigated for this application. The OFF to ON state switching threshold is only slightly dependent on nanotube type, but the ON/OFF current ratio depends on both nanotube type and concentration and varies up to 10(6), decreasing for nanotube concentrations larger than 0.50 wt% in the composite.