Figure 8. Calculated gap energies as a function of diameter for SWNTs as function of diameter, obtained by Kataura et al. The metallic windows in which metallic tubes are in resonance are presented for (a) SWNTs obtained by arc discharge on a RhPd catalyst, (b) SWNTs synthesized by laser ablation using a Co/Ni catalyst, and (c) SWNTs obtained by CO disproportionation at 950 °C over a CoMo catalyst. Reprinted with permission from [78], H. Kataura et al., Synth. Met. 103, 2555 (1999). © 1999, Elsevier Science.

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