Abstract
We present a theoretical model describing a plasma-assisted growth of carbon nanofibers (CNFs), which involves two competing channels of carbon incorporation into stacked graphene sheets: via surface diffusion and through the bulk of the catalyst particle (on the top of the nanofiber), accounting for a range of ion- and radical-assisted processes on the catalyst surface. Using this model, it is found that at low surface temperatures, T s, the CNF growth is indeed controlled by surface diffusion, thus quantifying the semiempirical conclusions of earlier experiments. On the other hand, both the surface and bulk diffusion channels provide a comparable supply of carbon atoms to the stacked graphene sheets at elevated synthesis temperatures. It is also shown that at low T s, insufficient for effective catalytic precursor decomposition, the plasma ions play a key role in the production of carbon atoms on the catalyst surface. The model is used to compute the growth rates for the two extreme cases of thermal and plasma-enhanced chemical vapor deposition of CNFs. More importantly, these results quantify and explain a number of observations and semiempirical conclusions of earlier experiments.
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Denysenko, I., Ostrikov, K., Azarenkov, N.A., Yu, M.Y. (2009). Effect of Plasma Environment on Synthesis of Vertically Aligned Carbon Nanofibers in Plasma-Enhanced Chemical Vapor Deposition. In: Hahn, H., Sidorenko, A., Tiginyanu, I. (eds) Nanoscale Phenomena. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00708-8_10
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DOI: https://doi.org/10.1007/978-3-642-00708-8_10
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