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(Color online) Schematic diagram showing the catalytic hydrogenation process of the SWNTs film by iron etching. (a) Distribution of a SWNTs film onto the SiO2/Si substrate. Some wrinkles are introduced during this process, which is marked by region B. (b) Thermal evaporation of iron film onto one end of the SWNTs film (region A). (c) Thermal annealing at 900 °C under the mixed gas of Ar and H2.
(Color online) The directional movements of iron particles on the SWNTs and different iron morphologies at different regions of the SWNTs film. (a) Iron source (region A), thick (region B), and thin (region C) SWNTs film. (b) Substrate, thick (region B), and thin (region C) SWNTs film. There are no directional movements of iron particles on the substrate. (c) At the locations far away from region A, there are iron particles at region B and no iron particles at region C. (d) The vivid picture of iron particles traveling on the surface of SWNTs.
(Color online) Raman spectra of as-grown SWNTs (bottom), thermally annealed SWNTs without iron deposition (middle) and GNRs (top). (a) Comparison of the RBM in SWNTs with the most characteristic RBLM of GNRs around 223 cm−1. (b) Significant changes in the G and 2D peak shape, frequency, and intensity of GNRs compared with those of SWNTs. These spectra are normalized to the G peak intensity.
(Color online) The comparison between the diameter of SWNTs ((a)-(c), scale bar: 10 nm) and the width of GNRs ((d)-(f), scale bar: 5 nm). It is obviously observable that the widths of Fe-etched SWNTs are much larger than the diameters of SWNTs.
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