Abstract
Cellular-type carbon fibers, prepared by heat-treatment of cellulose fibers that ranged from 500 to 2300 °C, were used as catalytic support for the growth of carbon nano-filaments. A comparison of the Raman spectra of products prepared at different heat-treatment temperatures showed significant variation in the carbon structure of the surfaces of the as-prepared carbon fibers. TEM observation clearly revealed that the products heat-treated below 1000 °C had an amorphous phase, and at 1500 °C they were similar to glassy carbon—an example of non-graphitizing carbon. Surface graphitization of the carbon fibers derived by pre-treatment at 1500 °C was accomplished at above 2000 °C. Multi-walled carbon nanotubes (MWCNTs), approximately 15 nm and 8 μm in diameter and length, were synthesized on the surface of the prepared carbon fibers via a tip growth mechanism. TEM images and Raman spectra confirmed that the higher synthesis temperature could lead to the formation of MWCNTs with better crystalline carbon shells.
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Acknowledgements
The authors thank Kwang-sik Myung (the Korea Institute of Energy Research: KIER) for the SEM analysis, and also Yun-chang Park (the National Nano Fab Center: NNFC) for the TEM analysis. This work was supported by the KIER (A9-2423).
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Jeong, N., Han, S.O., Kim, H. et al. Growth of multi-walled carbon nanotubes by catalytic decomposition of acetylene on Ni-supported carbon fibers prepared by the heat-treatment of cellulose fibers. J Mater Sci 46, 2041–2049 (2011). https://doi.org/10.1007/s10853-010-5036-9
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DOI: https://doi.org/10.1007/s10853-010-5036-9