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Kinetic Monte Carlo Simulations of the Response of Carbon Nanotubes to Electron Irradiation

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Abstract:

Irradiation is increasingly used nowadays to tailor the mechanical and electronic properties of carbon nanotubes. As the complete understanding of the response of nanotubes to irradiation is still lacking, we have implemented the kinetic Monte Carlo method with Bortz-Kalos-Lebowitz–algorithm in a simulation code which enables modeling the behavior of irradiated nanotubes on macroscopic time scales. Within our model, the paths and energy barriers for the diffusion of irradiation-induced defects are obtained from density-functional-theory–based calculations. We have applied the model to single-walled nanotubes subjected to electron irradiation in a transmission electron microscope at different temperatures. In perfect agreement with the experiments, our simulations indicate that at temperatures higher than 300 °C the annihilation of defects is efficient enough for almost perfect in situ self-healing of nanotubes. Our results on the irradiation doses needed to cut a single-walled nanotube with an electron beam are also similar to the experimental values. We also found that, surprisingly, for a certain range of relatively low temperatures (about 130–230 °C) the temperature increase can have a negative effect on the self-healing.

Keywords: CARBON NANOTUBES; DEFECTS; IRRADIATION; KINETIC MONTE CARLO METHOD

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jctn.2007.009

Publication date: September 1, 2007

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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