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Large-Diameter Single-Wall Carbon Nanotubes Formed Alongside Small-Diameter Double-Walled Carbon Nanotubes

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Figure 2. Raman spectra of the (a) G1R, (b) G2R, (c) G3R, and (d) G4R powders. Insets: the low-frequency RBMs.
Figure 3. FEG-SEM images of the (a) G1R, (b) G2R, (c) G3R, and (d) G4R powders.
Figure 7. Average diameters versus the iron content in the catalytic material: metal nanoparticles (black), outer diameter of all measured CNTs (green), diameter of SWCNTs (blue), and outer diameters of DWCNTs (red).
Figure 11. Mo ̈ssbauer spectra at room temperature or 85 K for G1R (a,e), G2R (b,f), G3R (c,g), and G4R (d,h)
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