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(a) A schematic of the top and side views of the telecentric optical monitoring system installed into our nanotube CVD furnace. (b) Time evolution of SWNT forest growth curve with 5 mm height. Inset graph shows the raw height data measured at a sampling frequency of 1 Hz (black curve). Red curve is smoothed curve by in situ filtering.
(a) Growth curves of multiple stop-and-go growth cycles, defined by a 3 min growth and 3 min interruption. The flow gas during the interruption were (red curve), He (blue curve), and concentration of 100–150 ppm in He (green curve), respectively. (b) Plot of the growth rates normalized to the initial growth rate at each cycle as a function of the total growth time.
(a) A series of nanotube forests automatically synthesized with set heights of 10, 100, 400, 800, and , respectively, and [(b)–(f)] their SEM images. (g) Plot of the error between the programmed and actual heights as a function of the programmed height.
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