Synthesis of carbon nanostructures by arc evaporation of graphite rods with Co–Ni and YNi2 catalysts

✍ Scribed by Boris P. Tarasov; Vyacheslav E. Muradyan; Yuri M. Shul’ga; Elena P. Krinichnaya; Nina S. Kuyunko; Oleg N. Efimov; Elena D. Obraztsova; Dmitry V. Schur; Jan Petter Maehlen; Volodymyr A. Yartys; Hong-Jen Lai

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 587 KB
• Volume: 41
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(03)00060-5

✦ Synopsis

Yields of single-walled carbon nanotubes (SWNTs) produced from electric arc evaporation of graphite electrodes with 3Co / Ni and YNi catalysts differ substantially. For instance, with YNi catalyst, the SWNT yield is |30-50 wt.% in 'collar' 2 2 soot and |10-15 wt.% in 'wall' soot, while with 3Co / Ni catalyst, the yields are |15-20 wt.% and 2-3 wt.%, respectively. According to Raman spectroscopy data, the average dimension of SWNTs is |1.2 nm for 3Co / Ni and |1.4 nm for YNi 2 catalyst. Optimum conditions for synthesis also differ for catalysts compared; namely, for 3Co / Ni: current intensity is 93 A, helium pressure is 650 Torr, the electrode gap is 2.5-3 mm; for YNi : current intensity is 98 A, helium pressure is 500 Torr, 2 the electrode gap is 1-2 mm.