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. 2020 May 28;11(6):546. doi: 10.3390/mi11060546

Figure 1.

Figure 1

Images of (group one) vertically aligned carbon nanotube (VACNT) forests grown from the Al/Fe catalyst. (a) SEM showing the top-down view of uniform VACNT forests. (b) TEM showing two aligned CNTs from the Al/Fe preparation. The dark contrast vertical lines are the walls of the multi-walled CNT (MWCNT). The dark object encapsulated inside the leftmost nanotube is likely a catalyst nanoparticle. (c) SEM image of (group two) VACNT rows 100 µm in width with 100 µm spacing, imaged at a 30 ° tilt. (d) SEM image of (group three) VACNT rows with a 2.5 µm width, 10 µm spacing, and 20 µm height imaged at an 85° tilt.