Growth mechanism of vertically aligned carbon nanotubes on silicon substrates

Study of CNTs and nanographite grown by thermal CVD using different precursors

“…1(c)) exhibits the presence of MWNTs, in which the iron particles are mainly in the tip and rarely in the body, suggesting that tip-growth mechanism [13,14] is predominant. This idea is confirmed by Electron probe microanalysis (EPMA), which gives a higher concentration of iron on the top of our structures (about 4 times higher than on the remaining of the sample).…”

TEM investigation on the growth mechanism of carbon nanotubes synthesized by hot-filament chemical vapor deposition

“…These small islands are not uniform in size and shape, which determine the diameters and growth time of CNTs. A growth model was proposed to explain the uniform height of nanotubes Kim, 2001, Choi andCho, 2002), but we found that the density of CNTs grown in 4 min is smaller than that grown in 7 min, which reveals that not all CNTs are grown at the same time, as can be seen from the SEM image of the CNT of a short growing time (Fig. 11).…”

Synthesis and characterization of carbon nanotubes on carbon microfibers by floating catalyst method

“…Since their discovery in 1991 [1], carbon nanotubes (CNTs) have attracted considerable attention and interest owing to unique physical and chemical properties [2][3][4], and CNTs also have been synthesized on different substrates [5][6][7][8][9]. However, some problems were present about the growth of CNTs on carbon microfibers (CMFs) substrate: catalyst was easily diffused into CMFs substrate and other carbonaceous byproducts were also easily brought [10,11].…”