A physical model for the growth mechanism of amorphous carbon nanotubes (ACNTs) (namely, “open tips growth and carbon clusters (Cn,n>6) adding”) has been proposed in this letter. Based on Tersoff–Brenner [Phys. Rev. B 37, 6991 (1988) and Phys. Rev. B 42, 9458 (1990)] and Lennard-Jones potential energy functions, a mathematic relationship for the growth of ACNTs was established. The predicted diameters of ACNTs from this physical model were in the range of 5–25 nm. The predicted values were in agreement with the experimental measurements in the range of 7–20 nm.
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Zhao et al. (2011) studied this question.
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